Photons and Electrons

Question 1

Frequency (f)

Answer 1

The number of disturbances per second. Unit is Hertz (Hz or s-1)

Question 2

Period (T)

Answer 2

The time taken for one complete disturbance to occur. Period is the INVERSE of frequency i.e.
Unit is seconds (s)

Question 3

Wave Speed (v)

Answer 3

he distance the wave travels in a given amount of time.
Unit is meters per second (m.s-1)

Question 4

Wavelength (λ)

Answer 4

The distance over which the wave’s shape repeats.
Unit is meters (m).

Question 5

Electromagnetic Radiation

Answer 5

Energy traveling at the speed of light in a vacuum is known as Electromagnetic
Radiation.

Question 6

The photo-electron (photo-electric) effect

Answer 6

the process that occurs when light
shines on a metal and electrons are ejected

Question 7

Photon

Answer 7

a quantum (energy packet) of light/EMR.

Question 8

Threshold (cut-off) frequency (𝒇𝒐)

Answer 8

The minimum frequency of incident radiation at which electrons will be emitted from a particular metal

Question 9

Work function (𝑾𝒐)

Answer 9

The minimum amount of energy needed to emit an electron from the surface of a metal.

Question 10

EINSTEIN’S EQUATION (PHOTOELECTRIC EQUATION)

Answer 10

E = Wo + Ek(max)

Question 11

Significance of photoelectric effect

Answer 11

The photoelectric effect establishes the quantum theory and it illustrates the particle nature of light