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 |
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 |
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 |