Give one use of microwaves.

One Line Answer

Microwaves are used for satellite communication.

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Chapter 6 Spectrum
EXERCISE - 6 (B) | Q 15. (a) | Page 144

Name the waves produced by the changes in the nucleus of an atom.

Name of physical quantity which remains same for microwaves of wavelength 1 mm and UV radiations of 1600 Å in vacuum.

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

A free atom of iron emits K_α 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.)

Name the scientist who discovered Microwaves

1. Calculate the speed of the wave.
2. Name the medium through which it is traveling.

Name two sources of infrared radiation.

State three properties of ultra-violet radiation similar to visible light.

Answer briefly.

Does an ordinary electric lamp emit EM waves?