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

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प्रश्न

Answer briefly.

Does an ordinary electric lamp emit EM waves?

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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

व्हिडिओ ट्यूटोरियलVIEW ALL [2]

संबंधित प्रश्‍न

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


Give a reason for the following:

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


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


When a Coolidge tube is operated for some time it becomes hot. Where does the heat come from?


One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?


50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1 mm thick aluminium foil. The potential difference between the target and the filament is increased. The thickness of the aluminium foil that will allow 50% of the X-ray to pass through will be


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


X-ray incident on a material
(a) exerts a force on it
(b) transfers energy to it
(c) transfers momentum to it
(d) transfers impulse to it.


The distance between the cathode (filament) and the target in an X-ray tube is 1.5 m. If the cutoff wavelength is 30 pm, find the electric field between the cathode and the target.

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


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?


What is the velocity of electromagnetic wave?

Name the scientist who discovered Ultraviolet rays


Two waves A and B have wavelength 0.01 Å and 9000 Å respectively.

Name the two waves. compare the speeds of these waves when they travel in vacuum.


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

Radar and Give the frequency range.


Name any two electromagnetic waves which have a frequency higher than that of violet light. State one use of each.


Name two sources of ultraviolet radiation.


State two properties of infrared radiations which differ from visible light.


Choose the correct option.

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


A bat moving at 10 ms−1 towards a wall sends a sound signal of 8000 Hz towards it. On reflection, it hears a sound of frequency f The value of f in Hz is close to (speed of sound = 320 ms−1)


A car is moving towards a high cliff. The car driver sounds a horn of frequency f. The reflected sound heard by the driver has a frequency 2f. If v be the velocity of sound, then the velocity of the car, in the same velocity units, will be:


Ozone layer above the earth's atmosphere will


Find the photon energy in units of ev for electromagnetic wave if waves length 40 m. Given h = 6.63 × 10–34 J.


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


The electric field intensity produced by the radiations coming from 100 W bulb at a 3 m distance is E. The electric field intensity produced by the radiations coming from 50 W bulb at the same distance is ______.


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.


What is the wavelength range of electromagnetic radiation used in radio broadcast?


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