Dual Nature of Matter and Radiation-Einstein's Photoelectric Equation (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 1 - 4 of 11

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Question number: 1

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

MCQ▾

Question

The separation between Bragg’s planes in a crystal is 10 Å. Then the wavelength of those X-rays which can be diffracted by this crystal is-

(1) 5 Å (2) 10 Å

(3) 20 Å (4) 25 Å

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

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1, 2 and 3 are correct

Question number: 2

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

MCQ▾

Question

An electromagnetic radiation of frequency 3 × 10 15 cycles per second falls on a photo electric surface whose work function is 4.0 eV Find out the maximum velocity of the photo electrons emitted by the surface-

Choices

Choice (4) Response

a.

1.73 × 10 6 m/s

b.

13.4 × 10 -19 m/s

c.

19.8 × 10 -19 m/s

d.

Question does not provide sufficient data or is vague

Question number: 3

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

MCQ▾

Question

Ultraviolet light of wavelength 280 nm is used in an experiment on photo electric effect with lithium (Φ = 2.5 eV) cathode.

(1) The maximum kinetic energy is 1.9 eV

(2) The stopping potential is 1.9 V

(3) The maximum kinetic energy is 4.4 V

(4) The stopping potential is 4.4 eV

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

Choices

Choice (4) Response

a.

1 and 3 are correct

b.

2 and 4 are correct

c.

1, 2 and 3 are correct

d.

1 and 2 are correct

Question number: 4

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

Assertion-Reason▾

Assertion (Ꭺ)

Photosensitivity of a metal is large if its work function is small.

Reason (Ꭱ)

Work function = hf 0. where f 0 is the threshold frequency.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true

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