Dual Nature of Matter and Radiation [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 5 of 97
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Question 1
Question Assertion-Reason▾
Assertion(Ꭺ)
Unit of Rydberg constant R is m-l
Reason(Ꭱ)
It follows from Bohr՚s formula the symbols have their usual meaning.
Choices
Choice (4) | Response | |
---|---|---|
a. | Ꭺ is false but Ꭱ is true | |
b. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ | |
c. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |
d. | Both Ꭺ and Ꭱ are false |
Question 2
Question MCQ▾
One electron & one proton is accelerated by equal potential. Ratio of their de-Broglie wavelengths is-
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 3
Question MCQ▾
A photon and an electron have equal energy E. is proportional to
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | Not depend upon E | |
c. | ||
d. |
Question 4
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 5
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 |