# +2 Physics Unit 7 - Dual Nature Of Radiation And Matter And Relativity

10 Questions

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Prepared by P. ILAIYARAJA M. Sc. ,B. Ed. , PG ASST IN PHYSICS , GHSS, PANCHANATHIKKULAM EAST, NAGAI DT.   ; & www. Padasalai. Net

• 1.
A photon of frequency ν is incident on a metal surface of threshold frequency νο. The kinetic energy of the emitted photoelectron is
• A.

(1)

• B.

(2)

• C.

(3)

• D.

(4)

• 2.
The work function of a photoelectric material is 3.3 eV. The threshold frequency will be equal to
• A.

(1)

• B.

(2)

• C.

(3)

• D.

(4)

• 3.
The stopping potential of a metal surface is independent of
• A.

• B.

• C.

The nature of the metal surface

• D.

Velocity of the electrons emitted.

• 4.
At the threshold frequency, the velocity of the electrons is
• A.

Zero

• B.

Maximum

• C.

Minimum

• D.

Infinite

• 5.
The photoelectric effect can be explained on the basis of
• A.

Quantum theory of light

• B.

Corpuscular theory of light

• C.

Wave theory of light

• D.

Electromagnetic theory of light

• 6.
The wavelength of the matter wave is independent of
• A.

Charge

• B.

Momentum

• C.

Velocity

• D.

Mass

• 7.
If the kinetic energy of the moving particle is E, then the de Broglie wavelength is,
• A.

(1)

• B.

(2)

• C.

(3)

• D.

(4)

• 8.
The momentum of the electron having wavelength 2Å is
• A.

(3)

• B.

(4)

• C.

(2)

• D.

(1)

• 9.
According to relativity, the length of a rod in motion
• A.

Is less than its rest length

• B.

is more than its rest length

• C.

May be more or less than or equal to rest length depending on the speed of the rod

• D.

is same as its rest length

• 10.
If 1 kg of a substance is fully converted into energy, then the energy produced is
• A.

(1)

• B.

(2)

• C.

(3)

• D.

(4)

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