Dual Nature of Matter and Radiation (NEET Physics): Questions 22 - 24 of 36

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Question number: 22

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

MCQ▾

Question

Electrons are accelerated in television tubes through potential difference of about 10 KV

(1) The lowest wavelength of the emitted X-rays is 12.4A

(2) The lowest wavelength of the emitted X-rays is 1.24 A

(3) The highest frequency of the emitted X-rays is 2.4 × 10 8 Hz

(4) The highest frequency of the emitted X-rays is 2.4 × l0 18 Hz

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

2 and 4 are correct

c.

1 and 2 are correct

d.

1 and 3 are correct

Question number: 23

» Dual Nature of Matter and Radiation » De-Broglie Relation

MCQ▾

Question

The de-Broglie wavelength of an electron is 0.2 Å. Calculate the potential difference (approximate) required to retard it to rest-

Choices

Choice (4) Response

a.

3.76 × 10 3 V

b.

3.76 × l0 -3 V

c.

376.5 V

d.

3.76 × 10 3 eV

Question number: 24

» Dual Nature of Matter and Radiation » Photoelectric Effect

MCQ▾

Question

The figure shows the variation of photocurrent with anode potential for a photo-sensitive surface for three different radiations. Let I a, I b and I c, be the intensities and f a, f b and f c be the frequencies for the curves a, b and c respectively. Then,

Photocurrent vs anode potential graph

Photocurrent vs Anode Potential Graph

The figure shows the variation of photocurrent with anode potential for a photo-sensitive surface for three different radiations.

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

f a = f c & I a = I c

d.

Equation

f Page
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