Name the waves used for taking photographs in dark. - Physics

Name the waves used for taking photographs in dark.

One Line Answer

Infrared rays are used for taking photographs in dark.

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Chapter 6 Spectrum
EXERCISE - 6 (B) | Q 16. (b) | Page 144

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

Give a reason for the following:

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

Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why?

State an additional use of the X-rays waves

Moseley's Law for characteristic X-ray is √v = a(Z − b). Here,

Name the scientist who discovered
X-rays

Arrange the following electromagnetic radiation in the ascending order of their frequencies:

X-rays, microwaves, gamma rays, radio waves

Electromagnetic waves of wavelengths λ₁, λ₂ and λ₃ are used in a radar system, in water purifiers and in remote switches of TV, respectively.

Name the electromagnetic radiation that has been used in obtaining the image below.