Question # 1

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

The numerical value of Compton wavelength is equal to

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3.43 x 10^-12 m

1.43 x 10^-12m

2.43 x 10^-12m

0.43 x 10^-12m

If an object moves with speed of light, its mass will be.

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Zero

Maximum

Minimum

infinity

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 existence of positron was discovered in:

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1929

1928

1931

1933

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

Disintegration of photon on striking a nucleus into an electron and positron is known as.

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Annihilation of matter

Compton effect

Pair production

Photo electric effect

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

The most refined form of matter is:

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Smoke

Light

Ice

Fog

Albert Einstein got noble prize for service in:

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Pair production

Annihilation of matter theory

Compton effect

Photoelectric effect

The photoelectric effect predicts that light is made of

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Photons

Neutrons

Protons

None of these

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

1 kg mass will be equivalent to energy.

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9 x 10⁸ J

9 X 10¹² J

9 X 10¹⁶ J

9 X 10¹⁹ J

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

The Compton effect is associated with

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X-rays

y-rays

Positive rays

ß-rays

Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

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Physics Fsc Part 2 Chapter 8 Online Test MCQs With Answers

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