Photoelectric Effect

Question 1

Photocurrent is

Answer 1

Directly proportional to Intensity

Question 2

Stopping Potential does

Answer 2

Not depend on intensity of incident light

Question 3

Stopping potential is

Answer 3

Directly proportional to incident frequency

Question 4

Photoelectric effect is a result of

Answer 4

One to one elastic collisions between photon and electrons in which photon is completely absorbed

Question 5

Einstein’s photoelectric equation

Answer 5

Ek= 1/2 *mv^2 = E-W = h(v-v•) = eV•

Question 6

For graph of max. Kinetic energy (in eV) and incident frequency:
1]Slope
2]Intercept

Answer 6

1]slope ->
h- planks constant

2] Intercept->
W

Question 7

For graph of stopping potential and incident frequency
1]Slope
2]Intercept

Answer 7

1] Slope-> h/e

2]Intercept-> W/e

Question 8

Einstein’s quantum theory

Answer 8

States that light travels in bundles/packets/quanta of energy

Question 9

Equation for ‘E’

Answer 9

E= hv = hc/₹ 
E = 12375/₹ eV

where ₹- lambda
v- frequency

Question 10

Einstein’s energy-mass equivalence equation

Answer 10

E=mc^2

Question 11

p=?

Answer 11

p=h/₹
= E/c
= hv/c
=mc

where: 
p-momentum
v-frequency 
₹-wavelength 
E-energy of each photon

Question 12

Number of photons emitted per second?

Answer 12

n= P/E
= P₹/hc
= P/hv

Where:
P-power
₹-wavelength
v-frequency