Dual Nature of Matter and Radiation [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 10 - 14 of 97
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Question 10
Question MCQ▾
From rest an electron is accelerated between two such points which has potential 20 & 40 volts respectively. Associated de-Broglie wavelength of electron is-
Choices
Choice (4) | Response | |
---|---|---|
a. | 7.5 Å | |
b. | 2.75 Å | |
c. | 0.75 Å | |
d. | 2.75 m |
Question 11
Question MCQ▾
Which of the following figure represents variation of particle momentum and the associated de-Broglie wavelength?
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 12
Question MCQ▾
One electron & one proton have equal energies then ratio of associated de-Broglie wavelength will be,
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 13
Question MCQ▾
A hydrogen atom moving at a speed v absorbs a photon of wavelength 122 nm and stops. Find the value of v. (Mass of hydrogen atom = 1.67 × 10-27 kg)
Choices
Choice (4) | Response | |
---|---|---|
a. | 3.5 m/s | |
b. | 3.05 m/s | |
c. | 32.5 m/s | |
d. | 3.25 m/s |
Question 14
Question Assertion-Reason▾
Assertion(Ꭺ)
Photosensitivity of a metal is large if its work function is small.
Reason(Ꭱ)
Work function = hf0. where f0 is the threshold frequency.
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are false | |
b. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |
c. | Ꭺ is false but Ꭱ is true | |
d. | Ꭺ is true but Ꭱ is false |