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# Selina solutions for Concise Physics Class 10 ICSE chapter 6 - Spectrum [Latest edition]

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## Chapter 6: Spectrum

Exercise - 6 (A)Exercise - 6 (B)Exercise - 6 (C)

### Selina solutions for Concise Physics Class 10 ICSE Chapter 6 Spectrum Exercise - 6 (A) [Pages 137 - 138]

Exercise - 6 (A) | Q 1 | Page 137

Name three factors on which the deviation produces by a prism depends and state how does it depend on the factors stated by you.

Exercise - 6 (A) | Q 2 | Page 137

How does the deviation produced by a triangular prism depend on the colours (or wavelengths) of light incident on it?

Exercise - 6 (A) | Q 3 | Page 137

How does the speed of light in glass change on increasing the wavelength of light?

Exercise - 6 (A) | Q 4 | Page 137

Which colour of white light travels (a) fastest (b) slowest, in glass?

Exercise - 6 (A) | Q 5 | Page 137

Name the subjective property of light related to its wavelength.

Exercise - 6 (A) | Q 6 | Page 137

What is the range of wavelength of the spectrum of white light in (i) Å, (ii) nm?

Exercise - 6 (A) | Q 7.1 | Page 137

Write the approximate wavelengths for (i) blue and (ii) red light.

Exercise - 6 (A) | Q 7.2 | Page 137

The wavelengths of violet and red light are 4000 Å  respectively. Which of the two has the higher frequency ?

Exercise - 6 (A) | Q 8 | Page 137

Write the seven prominent colours present in white light spectrum in order of their increasing wavelength.

Exercise - 6 (A) | Q 9 | Page 137

Name the seven prominent colours of the white light spectrum in order of their increasing frequencies.

Exercise - 6 (A) | Q 10 | Page 137

Name four colours of the spectrum of white light which have wavelength longer than blue light.

Exercise - 6 (A) | Q 11 | Page 137

Which colour of white light is deviated by a glass prism the most and which the least?

Exercise - 6 (A) | Q 12 | Page 137

The wavelengths for the light of red and blue colours are roughly 7.8 × 10^7 m and 4.8 × 10^7 m respectively.
(a) Which colour has the greater speed in vacuum?
(b) Which colour has the greater speed in glass?

Exercise - 6 (A) | Q 13 | Page 138

Define the term dispersion of light.

Exercise - 6 (A) | Q 14 | Page 138

Explain the cause of dispersion of white light through a prism.

Exercise - 6 (A) | Q 15 | Page 138

Explain briefly, with the help of a neat labelled diagram, how white light gets dispersed by a prism.

Exercise - 6 (A) | Q 16 | Page 138

What do you understand by the term spectrum?

Exercise - 6 (A) | Q 17 | Page 138

A ray of white light is passed through a glass prism and spectrum is obtained on a screen.
(a) Name the seven colours of the spectrum in order.
(b) Do the colours have the same width in the spectrum?
(c) which of the colour of the spectrum of white light deviates (i) the most, (ii) the least?

Exercise - 6 (A) | Q 18 | Page 138

The following diagram shows the path taken by a narrow beam of yellow monochromatic light passing through an equiangular glass prism. Now the yellow light is replaced by a narrow beam of white light incident at the same angle. Draw another diagram to show the passage of white light through the prism and label it to show the effect of prism on the white light.

Exercise - 6 (A) | Q 19.1 | Page 138

In following figure  shows a thin beam of white light from a source S striking on one face of a prism.

Complete the diagram to show effect of prism on the beam and to show what is seen on the screen.

Exercise - 6 (A) | Q 19.2 | Page 138

In following diagram shows a thin beam of white light from a source S striking on one face of a prism.

A slit is placed in between the prism and the screen to pass only the light of green colour. What will you then observe on the screen?

Exercise - 6 (A) | Q 19.3 | Page 138

In following diagram  shows a thin beam of white light from a source S striking on one face of a prism.

What conclusion do you draw from the observation in part (b) above?

Exercise - 6 (A) | Q 20.1 | Page 138

If a monochromatic beam of light undergoes minimum deviation through an equiangular prism, how does the beam pass through the prism, with respect to its base?

Exercise - 6 (A) | Q 20.2 | Page 138

If white light is used in same way as in part (a) above, what change is expected in the emergent beam?

Exercise - 6 (A) | Q 20.3 | Page 138

what conclusion do you draw about the nature of white light in part (b)?

### Selina solutions for Concise Physics Class 10 ICSE Chapter 6 Spectrum Exercise - 6 (A) [Page 138]

Exercise - 6 (A) | Q 1 | Page 138

When a white light ray falls on a prism, the ray at its first surface suffers.

• No refraction

• Only dispersion

• Only deviation

• Both deviation and dispersion

Exercise - 6 (A) | Q 2 | Page 138

In the spectrum of white light by a prism, the colour at the extreme end opposite to the base of prism is:

• Violet

• Yellow

• Red

• Blue

Exercise - 6 (A) | Q 3 | Page 138

The wavelength range of white light is :

• 4000 nm to 8000 nm

• 40 nm to 80 nm

• 400 nm to 800 nm

• 4 nm to 8 nm

### Selina solutions for Concise Physics Class 10 ICSE Chapter 6 Spectrum Exercise - 6 (A) [Page 138]

Exercise - 6 (A) | Q 1 | Page 138

Calculate the frequency of yellow light of wavelength 550nm. The speed of light is 3×10^8m/s^-1

Exercise - 6 (A) | Q 2 | Page 138

The frequency range of visible light is from 3.75 x 10^14 Hz to 7.5 x 10^14 Hz. Calculate its wavelength range. Take speed of light = 3 x 10^8m/s^-1

### Selina solutions for Concise Physics Class 10 ICSE Chapter 6 Spectrum Exercise - 6 (B) [Pages 144 - 145]

Exercise - 6 (B) | Q 1 | Page 144

(a) Give a list of at least five radiations, in order of their increasing frequencies, which make up the complete electromagnetic spectrum.

(b) Which of the radiation mentioned by you in part (a) has the highest penetrating power.

Exercise - 6 (B) | Q 2.1 | Page 144

Arrange the following radiations in the order of their increasing wavelength:
X-rays, infrared rays, ratio waves, gamma ray and micro waves?

Exercise - 6 (B) | Q 2.2 | Page 144

Which radiation is used for satellite communication?

Exercise - 6 (B) | Q 3.1 | Page 144

A wave has a wavelength of 0.01 Å of Name the wave.

Exercise - 6 (B) | Q 3.2 | Page 144

A wave has a wavelength of 0.01 Å of State its one property different from light.

Exercise - 6 (B) | Q 4.1 | Page 144

A wave has wavelength 50Å of name the wave.

Exercise - 6 (B) | Q 4.2 | Page 144

A wave has wavelength 50Å of State the speed in vacuum.

Exercise - 6 (B) | Q 4.3 | Page 144

A wave has wavelength 50Å of State its one use.

Exercise - 6 (B) | Q 5 | Page 144

(a) Name the high energetic invisible electro-magnetic wave which helps in the study of structure of crystals.
(b) State one more use of the wave named in part (a).

Exercise - 6 (B) | Q 6 | Page 144

State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of the visible spectrum.

Exercise - 6 (B) | Q 7 | Page 144

Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.

Exercise - 6 (B) | Q 8 | Page 144

Give the range of wavelength of the electromagnetic waves visible to us.

Exercise - 6 (B) | Q 9.1 | Page 144

Name the region beyond  the red end  of the spectrum.

Exercise - 6 (B) | Q 9.2 | Page 144

Name the region beyond the violet end of the spectrum called.

Exercise - 6 (B) | Q 10 | Page 144

What do you understand by the invisible spectrum?

Exercise - 6 (B) | Q 11.1 | Page 144

Name the radiation which can be detected by thermopile.

Exercise - 6 (B) | Q 11.2 | Page 144

Name the radiation which can be detected by a solution of silver chloride.

Exercise - 6 (B) | Q 12.1 | Page 144

State the approximate range of wavelength associated with  the ultraviolet rays .

Exercise - 6 (B) | Q 12.2 | Page 144

State the approximate range of wavelength associated with  the visible light .

Exercise - 6 (B) | Q 12.3 | Page 144

State the approximate range of wavelength associated with infrared rays.

Exercise - 6 (B) | Q 13.1 | Page 144

Name the radiations of wavelength just  longer than 8 x 10^-7m .

Exercise - 6 (B) | Q 13.2 | Page 144

Name the radiations of wavelength just Shorter than 4 x 10^-7 m.

Exercise - 6 (B) | Q 14 | Page 144

Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.

Exercise - 6 (B) | Q 15.1 | Page 144

Give one use of  microwaves .

Exercise - 6 (B) | Q 15.2 | Page 144

Give one use of ultraviolet radiations .

Exercise - 6 (B) | Q 15.3 | Page 144

Give one use of infrared radiations.

Exercise - 6 (B) | Q 15.4 | Page 144

Give one use of gamma rays.

Exercise - 6 (B) | Q 16.1 | Page 144

Name the waves of lowest wavelength.

Exercise - 6 (B) | Q 16.2 | Page 144

Name the rays or waves used for taking photographs in dark .

Exercise - 6 (B) | Q 16.3 | Page 144

Name the rays or waves produced by the changes in the nucleus of an atom .

Exercise - 6 (B) | Q 16.4 | Page 144

Name the rays or waves of wavelength nearly 0.1 nm.

Exercise - 6 (B) | Q 17 | Page 144

Two waves A and B have wavelength 0.01 Å and 9000 Å respectively.
(a) Name the two waves.
(b) Compare the speeds of these waves when they travel in vacuum.

Exercise - 6 (B) | Q 18 | Page 144

Name two sources, each of infrared radiations and ultraviolet radiations.

Exercise - 6 (B) | Q 19 | Page 144

What are infrared radiations? How are they detected? State one use of these radiations.

Exercise - 6 (B) | Q 20 | Page 144

What are ultraviolet radiations? How are they detected? State one use of these radiations.

Exercise - 6 (B) | Q 21 | Page 144

Name three properties of ultraviolet radiations which are similar to visible light.

Exercise - 6 (B) | Q 22 | Page 144

Give two properties of ultraviolet radiations which differ from the visible light.

Exercise - 6 (B) | Q 23 | Page 144

Mention three properties of infrared radiations similar to the visible light.

Exercise - 6 (B) | Q 24 | Page 144

Give two such properties of infrared radiations which are not true for visible light.

Exercise - 6 (B) | Q 25.1 | Page 144

Name the material prism required for obtaining the spectrum of ultraviolet light.

Exercise - 6 (B) | Q 25.2 | Page 144

Name the material prism required for obtaining the spectrum of infra red radiation.

Exercise - 6 (B) | Q 26 | Page 145

Name the radiations which are absorbed by the green house gases in the earth's atmosphere.

Exercise - 6 (B) | Q 27 | Page 145

State one harmful effect each of the ultraviolet and infrared radiation.

Exercise - 6 (B) | Q 28.1 | Page 145

Infrared radiations are used for photography in fog.

Exercise - 6 (B) | Q 28.2 | Page 145

Infrared radiations are used as signals during war

Exercise - 6 (B) | Q 28.3 | Page 145

The photographic darkrooms are provided with infrared lamps.

Exercise - 6 (B) | Q 28.4 | Page 145

A rock salt prism is used instead of a glass prism to obtain the infrared spectrum.

Exercise - 6 (B) | Q 28.5 | Page 145

A quartz is required for obtaining the spectrum of the ultraviolet light.

Exercise - 6 (B) | Q 28.6 | Page 145

Ultraviolet bulbs have a quartz envelope instead of glass

### Selina solutions for Concise Physics Class 10 ICSE Chapter 6 Spectrum Exercise - 6 (B) [Page 145]

Exercise - 6 (B) | Q 1 | Page 145

The most energetic electromagnetic radiations are :

• Microwaves

• Ultraviolet waves

• X-rays

• Gamma rays

Exercise - 6 (B) | Q 2 | Page 145

The source of ultraviolet light is :

• Electric bulb

• Red hot iron ball

• Sodium vapour lamp

• Carbon arc-lamp

Exercise - 6 (B) | Q 3 | Page 145

A radiations A is focused by a proper device on the bulb of a thermometer. Mercury in the thermometer shows a rapid increase. The radiations A is:

• Visible light

• X-rays

### Selina solutions for Concise Physics Class 10 ICSE Chapter 6 Spectrum Exercise - 6 (B) [Page 145]

Exercise - 6 (B) | Q 1.1 | Page 145

An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm Calculate the velocity of the wave.

Exercise - 6 (B) | Q 1.2 | Page 145

An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm.name the medium through which it is travelling

Exercise - 6 (B) | Q 2 | Page 145

The wavelength of X-rays is 0.01 Å. Calculate its frequency.

### Selina solutions for Concise Physics Class 10 ICSE Chapter 6 Spectrum Exercise - 6 (C) [Page 147]

Exercise - 6 (C) | Q 1 | Page 147

What is meant by scattering of light?

Exercise - 6 (C) | Q 2 | Page 147

How does the intensity of scattered light depends on the wavelength of incident light? State conditions when this dependence holds.

Exercise - 6 (C) | Q 3 | Page 147

When sunlight enters the earth’s atmosphere, state which colour of light is scattered the most and which the least.

Exercise - 6 (C) | Q 4.1 | Page 147

A Beam of Blue, Green and Yellow Light Passes Through the The Earth'S Atmosphere. Name the Colour Which is Scattered the Least

Exercise - 6 (C) | Q 4.2 | Page 147

A beam of blue, green and yellow light passes through the the Earth's atmosphere. Name the colour which is scattered the most

Exercise - 6 (C) | Q 5 | Page 147

Which colour of white light is scattered the least? Give reason.

Exercise - 6 (C) | Q 6 | Page 147

The danger signal is red. Why?

Exercise - 6 (C) | Q 7 | Page 147

How would the sky appear when seen from the space (or moon)? Give reason for your answer.

Exercise - 6 (C) | Q 8 | Page 147

What characteristic property of light is responsible for the blue colour of the sky?

Exercise - 6 (C) | Q 9 | Page 147

The colour of sky, in direction other than of the sun, is blue. Explain.

Exercise - 6 (C) | Q 10 | Page 147

Why does the sun appear red at sunrises and sunset?

Exercise - 6 (C) | Q 11 | Page 147

The sky at noon appears white. Give reason.

Exercise - 6 (C) | Q 12 | Page 147

The clouds are seen white. Explain

Exercise - 6 (C) | Q 13 | Page 147

Give reason why the smoke from fire looks white.

### Selina solutions for Concise Physics Class 10 ICSE Chapter 6 Spectrum Exercise - 6 (C) [Page 147]

Exercise - 6 (C) | Q 1 | Page 147

In white light of sun, maximum scattering by the air molecular present in the earth’s atmosphere is for :

• Red colour

• Yellow colour

• Green colour

• Blue colour

Exercise - 6 (C) | Q 2 | Page 147

To an astronaut in a space-ship, the earth appears:

• White

• Red

• Blue

• black

## Chapter 6: Spectrum

Exercise - 6 (A)Exercise - 6 (B)Exercise - 6 (C)

## Selina solutions for Concise Physics Class 10 ICSE chapter 6 - Spectrum

Selina solutions for Concise Physics Class 10 ICSE chapter 6 (Spectrum) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Physics Class 10 ICSE solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Concise Physics Class 10 ICSE chapter 6 Spectrum are Electromagnetic Spectrum, Some Natural Phenomena Due to Sunlight, Using a Triangular Prism to Produce a Visible Spectrum from White Light, Concept of Spectrum.

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