NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1250 - 1252 of 2320

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Question number: 1250

» Wave Optics » Young's Double Slit Experiment

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MCQ▾

Question

In an experiment similar to Young’s experiment, interference is observed using waves associated with electrons. The electrons are being produced in an electron gun. In order to decrease the fringe width,

(1) Electron gun voltage be increased.

(2) The slits be moved away from each other

(3) The screen be moved closer to interfering slits.

(4) Electron gun voltage be decreased.

Select the correct answers and mark it according to the following codes:

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

Question number: 1251

» Wave Optics » Brewster's Law

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MCQ▾

Question

A ray of light is incident on the surface of a glass plate at an angle of incidence equal to Brewster’s angle Φ. If μ represents the refractive index of glass with respect to air, then the angle between reflected and refracted rays is,

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 1252

» Dual Nature of Matter and Radiation » Einstein's Photoelectric Equation

Edit
Assertion-Reason▾

Question

Assertion (Ꭺ)

Photosensitivity of a metal is large if its work function is small.

Reason (Ꭱ)

Work function = hf 0. where f 0 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

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