Dual Nature of Radiation and Matter Test

Result

Dual Nature of Radiation and Matter Test - 34

Score
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Weekly Quiz Competition

Question 1
4 / -1

2mW light of wave length 4400 Å is incident on photo sensitive surface of Cs. If quantum efficiency is 0.5 %, what will be the value of photoelectric current ?

A
1.56 μA

B
2.56 μA

C
4.56 μA

D
3.56 μA

Solution
Question 2
4 / -1

A proton, a deutron and an a-particle having the same momentum, enters a region of uniform electric field between the parallel plates of a capacitor. The electric field is perpendicular to the initial path of the particles. Then the ratio of deflections suffered by them is

A
1 : 2 : 8

B
1 : 2 : 4

C
1 : 1 : 2

D
None of these

Solution
Question 3
4 / -1

In the following agreement y = 1.0 mm, d = 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photon is ..........

A
0.9 V

B
0.5 V

C
0.1 V

D
0.4 V

Solution
Question 4
4 / -1

Assertion : Stopping potential is a measure of K.E. of photo-electrons.
Reason : W = eV_s = 1/2 mv² = K. E

A
Both Assertion and Reason are true and Reason is correct explanation of Assertion.

B
Both Assertion and Reason are true, but Reason is not correct explanation of Assertion.

C
Assertion is true but the Reason is false.

D
Both Assertion and Reason is false.
Question 5
4 / -1

Assertion : Metals like Na or K, emit electrons even when visible lights fall on them .
Reason : This is because their work function is low.

A
Both Assertion and Reason are true and Reason is correct explanation of Assertion

B
Both Assertion and Reason are true, but Reason is not correct explanation of Assertion.

C
Assertion is true but the Reason is false

D
Both Assertion and Reason is false.
Question 6
4 / -1

Assertion : The de Broglie wavelength of an electron accelerated through 941 volts is 0.4 Å
Reason : Higher the acceleration potentials of electron, smaller is the de Broglie wavelength.

A
Both Assertion and Reason are true and Reason is correct explanation of Assertion

B
Both Assertion and Reason are true, but Reason is not correct explanation of Assertion.

C
Assertion is true but the Reason is false.

D
Both Assertion and Reason is false.
Question 7
4 / -1

Threshold - Frequency is equal to = ................ × 10¹⁴ Hz.

A
4.0

B
4.2

C
8.0

D
8.4

Solution
Question 8
4 / -1

An electron is accelerated under a potential difference of 64 V, the de Broglie wave length associated with electron is = ............. Å
(Use charge of electron = 1.6 × 10^–19 C, C = 9.1 × 10^–31 Kg, mass of electron h = 6.623 × 10^–34 J.sec))

A
4.54

B
3.53

C
2.53

D
1.534

Solution
Question 9
4 / -1

A α particle and proton has same K.E. The ratio of de Broglie wavelength of a α - particle and proton is....

A

B

C
1

D
2

Solution
Question 10
4 / -1

If α particle and proton have same momenta, the ratio of de Broglie wavelength of α -particle and proton is.....

A

B

C
1

D
2

Solution