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JEE • PHYSICS • DUAL NATURE OF RADIATION AND MATTER

Dual nature of radiation and matter practice · Medium

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Analyzing +4 | -1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Number of photons increases with increase in frequency of light.
Reason R: Maximum kinetic energy of emitted electrons increases with the frequency of incident radiation.
In the light of the above statements, choose the most appropriate answer from the options given below:

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Correct option: D

A is not correct but R is correct

Option D (A is not correct but R is correct) is correct because the number of photons decreases with increasing frequency at constant intensity, and the kinetic energy of emitted electrons increases with frequency.

302 Medium

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Understanding +4 | -1

Due to S.C.R. in vacuum tube

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Correct option: A

{I_p} \to

Decrease

Option A (

{I_p} \to

Decrease) is correct because the space charge region reduces the flow of electrons to the plate, thus decreasing the plate current.

303 Medium

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Application +4 | -1

A source

{S_1}

is producing

{10^{15}}

photons per second of wavelength

5000\mathop A\limits^ \circ .

Another source

{S_2}

is producing

1.02 \times {10^{15}}

photons per second of wavelength

5100\mathop A\limits^ \circ .

Then (power of

{S_2}

)/(power of

{S_1}

) is equal to

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Correct option: B

Option B (1) is correct because the ratio of powers is equal to the ratio of (number of photons * wavelength), which simplifies to 1.

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