Question

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 :

Answer 1

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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