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प्रश्न
Give one use of electromagnetic radiations in Infrared radiation.
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उत्तर
Infrared radiations are used as signals during the war.
संबंधित प्रश्न
State an additional use of the X-rays waves
Arrange the following radiations in the order of their increasing wavelength:
X-rays, infrared rays, ratio waves, gamma ray and microwaves.
How are X-rays produced?
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.
Find the cutoff wavelength for the continuous X-rays coming from an X-ray tube operating at 30 kV.
(Use Planck constant h = 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Name the radiation which can be detected by thermopile.
Answer briefly.
Why are microwaves used in radar?
The area to be covered for T.V telecast is doubled then the height of transmitting antenna (T.V tower) will have to be:-
What happens to the intensity of light from a bulb if the distance from the bulb is doubled? As a laser beam travels across the length of a room, its intensity essentially remains constant. What geometrical characteristic of LASER beam is responsible for the constant intensity which is missing in the case of light from the bulb?
