To Which Part of the Electromagnetic Spectrum Does a Wave of Frequency Belong? - Physics


To which part of the electromagnetic spectrum does a wave of frequency 5 × 1019 Hz belong?



The frequency 5×1019 Hz belongs to the gamma region of the electromagnetic spectrum.

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2013-2014 (March) All India Set 1

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What role dose infra-red radiation play in physical therapy?

Identify the part of the electromagnetic spectrum which is suitable for radar system used in aircraft navigation.

A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?

Give a reason for the following:

Long-distance radio broadcasts use short-wave bands. Why?

Give a reason for the following:

It is necessary to use satellites for long-distance TV transmission. Why?

The small ozone layer on top of the stratosphere is crucial for human survival. Why?

State Moseley's law

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 `10^8`m/`s^-1`

(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).

What is the range of the wavelength of the following electromagnetic waves?

(a) Micro waves .

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

Give one use of infrared radiations.

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

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

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

Which part of electromagnetic spectrum is used in radar systems?

In a Coolidge tube, electrons strike the target and stop inside it. Does the target get more and more negatively charged as time passes?

Can X-rays be used for photoelectric effect?

Can a hydrogen atom emit characteristic X-rays?

Why is exposure to X-rays injurious to health but not exposure to visible light, when both are electromagnetic waves?

The energy of a photon of a characteristic X-ray from a Coolidge tube comes from

The figure shows the intensity-wavelength relations of X-rays coming from two different Coolidge tubes. The solid curve represents the relation for the tube A in which the potential difference between the target and the filament is VA and the atomic number of the target material is ZA. These quantities are VB and ZB for the other tube. Then,

The Kβ X-ray of argon has a wavelength of 0.36 nm. The minimum energy needed to ionize an argon atom is 16 eV. Find the energy needed to knock out an electron from the K shell of an argon atom.

The electric current in an X-ray tube (from the target to the filament) operating at 40 kV is 10 mA. Assume that on an average, 1% of the total kinetic energy of the electron hitting hte target are converted into X-rays.
(a) What is the total power emitted as X-rays and (b) how much heat is produced in the target every second?

The Kα X-rays of aluminium (Z = 13) and zinc (Z = 30) have wavelengths 887 pm and 146 pm respectively. Use Moseley's  law √v = a(− b) to find the wavelengths of the Kα X-ray of iron (Z = 26).

(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)

The Kα and Kβ X-rays of molybdenum have wavelengths 0.71 A and 0.63 A respectively. Find the wavelength of Lα X-ray of molybdenum.

Continuous X-rays are made to strike a tissue paper soaked with polluted water. The incoming X-rays excite the atoms of the sample by knocking out the electrons from the inner shells. Characteristic X-rays are analysed and the intensity is plotted against the wavelength. Assuming that only Kα intensities are detected, list the elements present in the sample from the plot. Use Moseley's equation v − (25 × 1014Hz)(Z − 1)2.

(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)

Name the scientist who discovered

Name the scientist who discovered radio waves

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

Name the radiation which can be detected by thermopile.

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

To which regions of the electromagnetic spectrum do the following wavelengths belong: 
(a) 250 nm 
(b) 1500 nm 

Arrange the following electromagnetic waves in increasing order of their frequencies (i.e. begin with the lowest frequency):
Visible light, y rays, X rays, microwaves, radio waves, infrared radiations, and ultraviolet radiation.

Name the part of the electromagnetic spectrum which is: 
Suitable for radar systems used in aircraft navigation.

Name the part of the electromagnetic spectrum which is: 
Produced by bombarding a metal target with high electrons.

Calculate the shortest wavelength of electromagnetic radiation present in Balmer series of hydrogen spectrum.

Name the radiation of the electromagnetic spectrum which is used for the following:

Radar and Give the frequency range.

Choose the correct option.

The EM wave emitted by the Sun and responsible for heating the Earth’s atmosphere due to greenhouse effect is

Choose the correct option.

Earth’s atmosphere is richest in

Choose the correct option.

How does the frequency of a beam of ultraviolet light change when it travels from air into glass?

Answer briefly.

Why are microwaves used in radar?

Answer briefly.

Can we produce a pure electric or magnetic wave in space? Why?

Answer briefly.

Does an ordinary electric lamp emit EM waves?

Answer briefly.

Why light waves travel in a vacuum whereas sound waves cannot?

Answer briefly.

What are the ultraviolet rays?

Answer briefly.

Give two uses of ultraviolet rays.

Answer briefly.

What are radio waves?

Answer briefly.

Name the most harmful radiation entering the Earth's atmosphere from outer space.

Answer briefly.

What is a carrier wave?

Answer briefly.

Why high-frequency carrier waves are used for the transmission of audio signals?

Solve the numerical problem.

Calculate the frequency in MHz of a radio wave of wavelength 250 m. Remember that the speed of all EM waves in a vacuum is 3.0 × 108 m/s.

Solve the numerical problem.

Calculate the wavelength in nm of an X-ray wave of frequency 2.0 × 1018 Hz.

Solve the numerical problem.

The speed of light is 3 × 108 m/s. Calculate the frequency of red light of a wavelength of 6.5 × 10−7 m.

Calculate the wavelength of a microwave of a frequency of 8.0 GHz.

X-rays, gamma rays and microwaves travelling in a vacuum have ______.

The fundamental frequency of an open organ pipe is 300 Hz. The first overtone of this pipe has same frequency as first overtone of a closed organ pipe. If speed of sound is 330 m/s, then the length of closed organ pipe is:

For television broadcasting, the frequency employed is normally

The frequency of x-rays, y-rays and ultraviolet rays are respectively a, b and c. Then:-

The ozone layer absorbs

Following QN ∴ 14, the radiation force on the roof will be

The frequency of e. m waves which is best suited .to observed of radius 3 × 10–4 his of the order of

Ozone layer above the earth's atmosphere will

A radio can tune to any station in the 7.5 mHz to 12 MHz band. What is corresponding wave length band.

Radio waves of constant amplitude can be generated with.

SONAR emits which of the following waves?

If λv, λx and λm Am represents the wavelength of visible light, x-ray and microwaves respectively, then ______.

All components of the electromagnetic spectrum in a vacuum have the same ______

The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is ______.

The half-value thickness of an absorber is defined as the thickness that will reduce exponentially the intensity of a beam of particles by a factor of 2. The half-value thickness in (µm) for lead assuming X-ray beam of wavelength 20 pm, µ = 50 cm-1 for X-rays in lead at wavelength λ = 20 pm, is ______ µm.

In uranium (Z = 92) the K absorption edge is 0.107 Å and the Kα line is 0.126 Å, and the wavelength of the L absorption edge is ______.

Given below in the left column are different modes of communication using the kinds of waves given in the right column. 

A.  Optical Fibre
P. Ultrasound
B. Radar Q. Infrared Light
C. Sonar R. Microwaves
D. Mobile Phones  S. Radio Waves

From the options given below, find the most appropriate match between entries in the left and the right column.

Which is the correct ascending order of wavelengths?

Photons of an electromagnetic radiation has an energy 11 keV each. To which region of electromagnetic spectrum does it belong? 

Give any two uses of infrared waves.

Identify the electromagnetic radiation and write its wavelength range, which is used to kill germs in water purified. Name the two sources of these radiations.

Identify the part of the electromagnetic spectrum which:

  1. produces the heating effect.
  2. is absorbed by the ozone layer in the atmosphere.
  3. is used for studying crystal structure.

Write any one method of the production of each of the above radiations.


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