Optical Phenomena and Properties of Materials

Question 1

photoelectric effect

Answer 1

The process whereby electrons are ejected from a
metal surface when light of suitable frequency is incident on that surface.

Question 2

Threshold frequency

Answer 2

The minimum frequency of light needed to emit
electrons from a certain metal surface.

Question 3

Work function

Answer 3

work function, Wo,as the minimum energy that anelectron in the metal needs to
be emitted from the metal surface.

Question 4

Explain the effect of intensity and frequency on the photoelectric effect.

Question 5

atomic absorption spectrum

Answer 5

It is formed when certain frequencies of electromagnetic radiation passing through a substance is absorbed.

Question 6

An atomic emission spectrum

Answer 6

It is formed when certain frequencies of
electromagnetic radiation are emitted due to an atom making a transition from a higher energy state to a lower energy state.