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Answer briefly. Does an ordinary electric lamp emit EM waves? - Physics

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प्रश्न

Answer briefly.

Does an ordinary electric lamp emit EM waves?

एका वाक्यात उत्तर
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उत्तर

Yes, an ordinary electric lamp emits EM waves.

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पाठ 13: Electromagnetic Waves and Communication System - Exercises [पृष्ठ २४०]

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बालभारती Physics [English] Standard 11 Maharashtra State Board
पाठ 13 Electromagnetic Waves and Communication System
Exercises | Q 2. (vi) | पृष्ठ २४०

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संबंधित प्रश्‍न

What role dose infra-red radiation play in maintain the Earth’s warmth


Identify the part of the electromagnetic spectrum which is:

produced by bombarding a metal target by high speed electrons.


To which part of electromagnetic spectrum does a wave of frequency 3 × 1013 Hz belong?


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?


State an additional use of the X-rays waves


State Moseley's law


(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.


Name the region beyond  the red end  of the spectrum.


What do you understand by the invisible spectrum? 


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


Give one use of gamma rays.


The wavelength of X-rays is 0.01 Å. Calculate its frequency. State the assumption made, if any.


How are X-rays produced?


Can Lα X-ray of one material have shorter wavelength than Kα X-ray of another?


X-ray from a Coolidge tube is incident on a thin aluminium foil. The intensity of the X-ray transmitted by the foil is found to be I0. The heating current is increased to increase the temperature of the filament. The intensity of the X-ray transmitted by the foil will be
(a) zero
(b) < I0
(c) I0
(d) > I0


A free atom of iron emits Kα X-rays of energy 6.4 keV. Calculate the recoil kinetic energy of the atom. Mass of an iron atom = 9.3 × 10−26 kg.

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


Suppose a monochromatic X-ray beam of wavelength 100 pm is sent through a Young's double slit and the interference pattern is observed on a photographic plate placed 40 cm away from the slit. What should be the separation between the slits so that the successive maxima on the screen are separated by a distance of 0.1 mm?


Name the scientist who discovered Ultraviolet rays


An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm.
    1. Calculate the speed of the wave.
    2. Name the medium through which it is traveling.

Define the term "Intensity" in the photon picture of electromagnetic radiation. 


Give one use of electromagnetic radiation in Microwaves.


Give one use of electromagnetic radiation in Ultraviolet radiation.


Choose the correct option.

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


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.


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


What is time period of the light for which the eye is most sensitive?


Choose the correct option related to wavelengths (λ) of different parts of the electromagnetic spectrum.


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