NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1225 - 1228 of 2320

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Question number: 1225

» Wave Optics » Young's Double Slit Experiment

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Question

In Young’s double slit experiment, white light is used. The separation between the slits is b. The screen is at a distance d (d > > b) from the slits. Some wavelengths are missing exactly in front of one slit. One of these wavelengths is

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 1226

» Properties of Solids & Liquids » Latent Heat

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A lead bullet at 25°C just n tits when stopped by an obstacle. Assuming that 25 % of heat is absorbed by the obstacle, then the velocity of the bullet at the time of striking (M. P. of lead = 320°C, specific heat of lead = 0.02 cal/gm°C, latent heat of fusion of lead = 6 cal/gm and J = 4.2 joule/cal)

Choices

Choice (4)Response

a.

307.5 m/sec

b.

4.010 m/sec

c.

0.365 m/sec

d.

Question does not provide sufficient data or is vague

Question number: 1227

» Wave Optics » Huygens' Principle

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Question

In an interference pattern, at a point we observe the 16 th order maximum for λ 1 = 6000A. What order will be visible here if the source is replaced by light of wavelength? λ 2 = 4800 Å

Choices

Choice (4)Response

a.

10

b.

20

c.

40

d.

80

Question number: 1228

» Wave Optics » Polarization

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Question

Two Polaroids are oriented with their planes perpendicular to incident light and transmission axis making an angle of 30 0 with each other. What fraction of incident unpolarised light is transmitted?

Choices

Choice (4)Response

a.

17.5 %

b.

27.5 %

c.

37.5 %

d.

57.5 %

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