Question # 1

The number of electrons emitted depend upon

Choose an answer

Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

The unit of work function is

Choose an answer

eV

Volt

Farad

Herdz

Joule-second is the unit of:

Choose an answer

Energy

Heat

Planck’s constant

None of these

Potassium cathode in photocell emits electrons for a light:

Choose an answer

Visible

Infrared

Ultraviolet

X-rays

The energy of photon of energy 1 eV is:

Choose an answer

1240 nm

1040 nm

1000 nm

620 nm

The dimensions of Planck’s constant “h” are same as that of:

Choose an answer

Momentum

Angular momentum

Work

Torque

De-Broglie received the Nobel prize on his work on:

Choose an answer

Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

Which of the particles, electron, proton and neutron moving with same speed has longest wave length?

Choose an answer

Electron

Proton

Neutron

All have same

A photo cell is based on:

Choose an answer

Compton effect

Pair production

Photo cell

All of these

In a photocell, certain metal emits electrons for :

Choose an answer

Visible light

Infrared light

Ultraviolet light

All of these

In order to perform experiment, Davisson and Germer used accelerating voltage of:

Choose an answer

54V

120V

220V

400V

A human eye can detect the electromagnetic radiations of the type:

Choose an answer

Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

The reverse process of photo-electric effect is called:

Choose an answer

Pair production

Compton effect

Annihilation of matter

X-rays

Photo cells are used for :

Choose an answer

Security and counting system

Automatic door system

Automatic street lighting

All of these

In photoelectric effect, if we increase the frequency of the incident light then of the electrons increased

Choose an answer

Number

K.E

P.E

Frequency

Photoelectric effect and Compton effect prove the:

Choose an answer

Wave nature of light

Particle nature of light

Dual nature of light

The stopping potential for a certain metal is 10 volt, the max. Energy of emitted electron is:

Choose an answer

10 J

100 J

1.6 × 10-18 J

1.6 × 10-19 J

Davisson and Germer, in their experiment used:

Choose an answer

Nickle crystal

Lead crystal

Graphite crystal

Glass

Davisson and Germer received the Nobel prize for their work on:

Choose an answer

Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

In a photocell, cesium coated oxidized silver emits electrons for :

Choose an answer

Visible light

Infrared light

Ultraviolet light

All of these

A human eye can detect the electromagnetic radiations of the type:

Choose an answer

Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

The energy of photon of wavelength 620 nm is:

Choose an answer

0.5 eV

1.0 eV

1.5 eV

2.0 eV

Moving photons posses:

Choose an answer

Energy

Momentum

Wavelength

All of these

The unit Compton wavelength is same as:

Choose an answer

Compton wavelength

Compton frequency

Compton shift

Both (a) & (b)

Photo cells is a device which convert light into:

Choose an answer

Wave nature

Particle nature

Particle wave nature

Dual nature

Compton Effect makes the use of the law of conservation of:

Choose an answer

Energy

Momentum

Charge

Both (a) & (b)

Rest mass energy of electron is:

Choose an answer

1.02 MeV

0.51 MeV

931 MeV

200 MeV

The maximum kinetic energy of emitted photoelectrons depends upon:

Choose an answer

The intensity of incident light

Frequency of incident light

Metal surface

Both frequency of incident light and metal surface

More Classes

Other Links

MDCAT Physics Chapter 15 Modern Physics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer