Question # 1

Number of electros emitted in photo electric effect depend upon.

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Intensity of incident light

Frequency of incident light

Energy of incident light

Wavelength of incident of light

Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

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4.5 eV

4.25 eV

4.75 eV

0.25 eV

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

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50 V

2 V

5 V

15 V

unit of Plank's constant is same as that of.

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Acceleration

Angular momentum

Linear momentum

Entropy

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

Max planck received noble prize in:

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1927

1932

1918

1914

Compton's effect is associated with

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gamma rays

Beta rays

X rays

Positive rays

Eintein's Photoelectric equation is E_k= hf -∅ in this equation E₁, refers to:

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K.E of al the emited electrons

Mean K.E of emited electrons

Maximum K.E of emited electrons

Minimum K.E of emited electrons

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

The wavelength associated with the protons moving at speed of 40 m/s is.

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7.20 nm

9.02

15.7 nm

17.3 nm

The maximum kinetic energy of emitted photo electrons depends upon.

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The intensity of incident light

Frequency of the incident light

Metal surface

Both frequency of incident light and metal surface.

Pair production cannto take place in vacuum because :

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Mass in not conserved

Momentum is not conserved

Energy is not conserved

Charge is not conserved

Albert Einstein got noble prize for service in:

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Pair production

Annihilation of matter theory

Compton effect

Photoelectric effect

The dimensions of Plank's constant is same as that of.

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Energy

Power

Acceleration

Angular momentum

Maximum Compton shift is observed at.

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30^oC

90^oC

45^oC

180^oC

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

Which one of the following paved the way for modern physics

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Newtonian mechanics

Theory of relativity

Quantum theory

All of above

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

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