Dual Nature of Matter and Radiation-Einstein's Photoelectric Equation [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 3 of 14

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Question 1

Question MCQ▾

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

Edit

Question 2

Question MCQ▾

An electromagnetic radiation of frequency 3 × 1015 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.

13.4 × 10-19 m/s

b.

19.8 × 10-19 m/s

c.

1.73 × 106 m/s

d.

All of the above

Edit

Question 3

Question MCQ▾

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.

1,2 and 3 are correct

b.

1 and 2 are correct

c.

1 and 3 are correct

d.

2 and 4 are correct

Edit