Question

QUESTION 10

1. Which of the following verified that photons have momentum?

		X-ray diffraction experiments
		Double slit experiments
		Compton effect
		interference

QUESTION 11

1. The French scientist Louis de Broglie was the first to recognize that

		waves have a wavelength and moving particles have a momentum.
		waves have a frequency and moving particles have kinetic energy
		waves have a speed and moving particles have a speed
		waves have a momentum and moving particles have a wavelength

QUESTION 12

1. The fantastic experiments by Rosalind Franklin which revealed the structure of the DNA molecule relied on the

		wave properties of X-rays
		particle properties of X-rays
		that electrons have wave properties
		that electrons have particle properties

Answer 1

QUESTION 10

Compton effect

The Compton effect is the name given to the experiment of scattering of a photon by an electron (usually) or by a charged particle. In this experiment, the photon makes an elastic collision with an electron and bounces off a target electron from the outer shell of an atom or molecule. The wavelength shift experienced by the scattered radiation cannot be explained in terms of classical wave theory, thus supports Einstein's photon Theory.

QUESTION 11

waves have a speed and moving particles have a speed

De Broglie's finding was about the wave-particle duality. It means that an object can act both as a wave and a particle at the same time. Hence wave posses particle nature and particle posses wave nature.

QUESTION 12

particle properties of X-rays

The method used is X-ray crystallography. It is used for ascertaining the atomic or molecular structure of a crystal in which the crystalline structure causes a beam of X-rays to diffract into many directions.