Question # 1

The number of electrons emitted depends upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

The energy of the photon of wavelength 500 nm is.

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3.10 eV

2.49 eV

1.77 eV

1.52 eV

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

When platinum wire is heated, it changes to cherry red at temperature.

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500^oC

900^oC

1100^oC

1300^oC

Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

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√2

1/√2

2

1/2

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

Albert Einstein got noble prize in:

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1926

1921

1918

1931

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

In 1905, the special theory of relativity was proposed by

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Einstein

Bohr

Maxwell

De Broglie

When platinum is it becomes orange at

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500^oC

900^oC

1100^oC

1300^oC

Einstein photoelectric equation is

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None of these

An electron miroscope emplys which to one of the following particles?

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Electron ahve a wave nature

Electrons can be focused by an electric field

Electrons can be focused by a magnetic field

All of the above

The photoelectric effect predicts that light is made of

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Photons

Neutrons

Protons

None of these

The uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

Antiparticle of electron is.

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proton

Photon

Positron

Neutron

The unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

The value of Wien's constant:

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2.9x10^-3mk

2.19x10^-7mk

3.18 x10⁶ km^-1

6.21 x 10^-9m²wk³

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Physics FSC Part 2 Chapter 19 Online MCQ's Test MCQs With Answers

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