Question

Which observation supports the idea that light is made of particles?
A.Light is produced by the interaction of magnetic and electric fields.
B.Light spreads out after passing through an opening.
C.Light diffracts when it hits a barrier.
D.Light moves in a straight path.

Answer 1

Answer: The correct answer is oiption (D).

Explanation:

Light is made up of small packets of energy which named as photons. And this photon has zero rest mass and they travel in straight direction.

These particles of light associated with certain amount of energy which related to the wavelength and frequency of the light.

$E_{photon}=h\nu=\frac{hc}{\lambda }$

$\nu$ = frequency of the light

h = planks constant

c = speed of the light

$\lambda$ = wavelength if the light

Hence, the correct answer is option (D).

Answer 2

Answer: Option D.

Explanation: The duality nature of the light comes from the fact that the light can behave like a wave and like a particle.

The fact that the light travels in a straight line and that it can push things (for example the sails in some space things) is what tell us that the light may behave like particles.

Then the right answer between the given options is D

"Light moves in a straight path"

While the other 3 options support the wave behavior of the light.