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

Edit

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.

Plot of Momentum vs De-Broglie Wavelength – Choice A

b.

Plot of Momentum vs De-Broglie Wavelength – Choice B

c.

Plot of Momentum vs De-Broglie Wavelength – Choice C

d.

Plot of Momentum vs De-Broglie Wavelength – Choice D

Edit

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.

Edit

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

Edit

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

Edit