Question

Choose one of the following topics and write at least two substantial paragraphs that briefly explain both the topic itself and how the topic relates to our study of light.

The Double-slit experiment
The Photoelectric Effect
Emission spectra of gases composed of a single element

Answer 1

We have tabulated the answer for your convenience.

S. No.	Aspect	Description
(1)	Topic chosen	The Photoelectric Effect
(2)	Definition	Photoelectric effect is defined as the phenomena in which electrons are emitted from a metal surface when light or electromagnetic radiation is allowed to fall on the surface of metal.
(3)	Mathematical representation	When an electron is ejected from the metal surface due to photoelectric effect, it gains kinetic energy, K. Maximum value of this kinetic energy is given by following expression: Kmax = hf – Φ Where, h = planck’s constant f = frequency of the incident photon of light Φ = work function of metal surface
(4)	Explanation of the mathematical expression	(a)The incident photon of light, which falls on metal surface has energy hf. (b)Φ is the work function, which means it acts as threshold of energy which incident light or photon has to overcome. (c)Once incident energy hf is greater than Φ, the electron is emitted from metal surface with some kinetic energy.

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