The amount of photoelectric emission current depends on

The stopping potential in photoelectric emission does not depend upon the frequency of the incident radiation.

A

True

B

False

Photoelectric emission is possible at all frequencies.

A

True

B

False

The photoelectric emission could be explained by the ____________

A

Wave nature of light

B

Particle nature of light

C

Dual nature of light

D

Quantum nature

Consider the following sentences.
1. The phenomenon of emission of electrons from metals under the effect of light rays is called photoelectric effect.
2. The electron emitted by the photoelectron effect are called proton.
3. The phenomena like interference diffraction and polarisation were explained successfully on the basis of wave nature of radiation.
Which of the above sentence/sentences is/are correct?

A

1 and 2

B

2 and 3

C

1 and 3

D

None of the above

Working of safety fuses depends upon 1. magnetic effect of the current 2. chemical effect of the current 3. magnitude of the current 4. heating effect of the current Select the correct answer using the code given below.

A

1, 2, 3 and 4

B

1, 2 and 3 only

C

3 and 4 only

D

4 only

Working of safety fuses depends upon
1. magnetic effect of the current
2. chemical effect of the current
3. magnitude of the current
4. heating effect of the current
Select the correct answer using the code given below.

A

1, 2, 3 and 4

B

1, 2 and 3 only

C

3 and 4 only

D

4 only

β-rays emission in radioactive disintegration is always accompanied by the emission of

A

γ-rays

B

α-rays

C

Neutrons

D

None of these

Assertion: For higher temperatures, the peak emission wavelength of a black body shifts to lower wavelengths. Reason: Peak emission wavelength of black body is proportional to the fourth power of temperatures.

A

Both assertion and reason are true and the reason is the correct explanation of the assertion

B

Both assertion and reason are true but the reason is not a correct explanation of the assertion

C

Assertion is true but the reason is false

D

Both assertion and reason are false

The radiation emission process (emission of a proton at frequency) can occur in __________ ways.

A

Two

B

Three

C

Four

D

One

An incandescent lamp is operating at a temperature of 1000K at an operating frequency of 5.2×1014 Hz. Calculate the ratio of stimulated emission rate to spontaneous emission rate.

A

3×10-13

B

1.47×10-11

C

2×10-12

D

1.5×10-13

The amount of photoelectric emission current depends on

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