Dual Nature Of Radiation And Matter

Question 1

Who proved that l8ght have dual nature and on basis of which theory ?

Answer 1

Einstein on basis of planks quantum theory

Question 2

Methods of removing electron from the metal surfaces are

Answer 2

Thermoionic ,feild emissions, secondary emissions, photoelectric emissions

Question 3

Work function =
1.Unit
Best photosensitive material

Answer 3

ev
Cesium

Question 4

Photoelectric effect Discovered by

Answer 4

Heinrich hertz

Question 5

Variation of photoelectric effect with 1intensity and 2current and 3 distance

Answer 5

Directly
Directly
Inversely square

Question 6

Saturation current

Answer 6

When all photoelectrons are emmited and collected by A plare then current value maxi is such value called saturation current

Question 7

Current relation with Vapplied

Answer 7

Directly

Question 8

Stopping potential that is minimum and negative potential given that stops current is given to whom

Answer 8

A plate

Question 9

Stopping potential varies with frequency by

Answer 9

Directly

Question 10

Saturation current value when intensity is constant

Answer 10

Equal for all frequencies

Question 11

What is threshold frequency

Answer 11

Minimum frequency for which the emissions of photoelectroh emissions starts is called as threshold frequency

Question 12

Relation bet frequency and stopping potential

Answer 12

Directly

Question 13

Einstein photoelectric equation is

Answer 13

h×frequency -work function =KEmax

Question 14

Energy given by plank on metal surface is used by method

Answer 14

Part of energy as work function and part to give velocity max equal to KE max

Question 15

Einstein photoelectric equation is based on

Answer 15

Energy conservation

Question 16

Relation between frequency stopping potential and wavelength is

Answer 16

V=hfrequency - hfrequencynot
—————– ——————–
e e

Question 17

Energy /power of nphoton through area is

Answer 17

Nhc/lambda

Question 18

Power of photos passing through area is

Answer 18

E/t

Question 19

Intensity of photoelectric is

Answer 19

Power / area

Question 20

n is equal to in nhc/lambda

Answer 20

n=N/t

Question 21

Pressure and force on pure reflecting surface is

Answer 21

Force nhc/lambda
Pressure nhc/lambda area

Question 22

Pressure per unit area is

Answer 22

Intensity

Question 23

Work function depend upon

Answer 23

Nature of metal and surface

Question 24

Do all photelectrkns emmited have same energy

Answer 24

No

Question 25

Stopping g potential is sufficient when

Answer 25

It can repel electron with most kinetic energy

Question 26

If intensity is increased then frequency of pbotoelectron to increase then what aboutstoppingpotencial

Answer 26

Not affected reaming the same as in initial condition

Question 27

Kinetic energy relation with frequency and intensity in Einstein photoelectric equation

Answer 27

Directly with frequency and Independent of intensity

Question 28

Photon energy relation with intensity

Answer 28

Not related

Question 29

Photons are electrically

Answer 29

Neutral

Question 30

When photon and ele treon collide then effect is called as

Answer 30

Energy and momentum tum get conserved and Compton effect

Question 31

Photocell means and principle

Answer 31

Convert light to electrical energy Principleof photoelectric emissions

Question 32

Change in wavelengths Compton effect called

Answer 32

Compton shift

Question 33

Formula of pressure and intensity perfectly reflecting surface

Answer 33

2I/c

Question 34

Relation between I and pressurefor perfectly absor ing surface

Answer 34

I/c

Question 35

Rest mass of photon is

Answer 35

Zero

Question 36

Power of photon

Answer 36

nhc/lambda

Question 37

Scattering angle in davissioh and Gerber experience entis

Answer 37

50 °