Question

# 19. De Broglie's conjecture was to assert that a. light, if it has wavelength λ, also...

19. De Broglie's conjecture was to assert that

a. light, if it has wavelength λ, also has momentum p = h / λ.

b. a particle, if it has momentum p, also has wavelength λ = h / p.

c. mass and energy are equivalent.

20. The source of all electromagnetic waves is :

Note: The Q 20 does not have options so, I just answered it generally.

Solution:

19.)

Ans: B a particle, if it has momentum p, also has wavelength = h / p.

Reason:

The de Broglie relation asserts that a particle moving with momentum p can behave as if it were a wave of wavelength (wavelength = h/p).

This relation is the origin of wave-particle duality, which means that matter can show either particle like or wavelike behavior depending on the conditions of the observation.

20.)

Ans: Accelerating electric charges.

Reason: Vibrating electric charge changing electric and magnetic waves.

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