NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1257 - 1261 of 2320

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Question number: 1257

» Properties of Solids & Liquids » Heat Transfer » Radiation

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Question

A black body is at a temperature of 2880 K. The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is U 1 between 999 nm and 1000 nm is U 2 and between 1499 nm and 1500 nm is U 3 . The Wein’s constant b = 2.88 x 10 6 nm K. Then

Choices

Choice (4)Response

a.

U 1 > U 2

b.

U 2 > U 1

c.

d.

Question number: 1258

» Thermodynamics » Laws of Thermodynamics » Second Law of Thermodynamics

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The pressure in the tyre of a car is four times the atmospheric pressure at 300 K. If this tyre suddenly bursts, its new temperature will be (γ = 1.4)

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 1259

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Question

When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas, is

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 1260

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Question

An electron microscope uses 40 keV electrons. Find its resolving limit on the assumption that it is equal to the wavelength of the electron-

Choices

Choice (4)Response

a.

0.61 Å

b.

0.061 Å

c.

0.6 Å

d.

0.06 Å

Question number: 1261

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Question

A body initially at 90° C cools to 60° C in 5 minutes and to 50° C in 10 minutes. The temperature of the body after 15 minutes will be

Choices

Choice (4)Response

a.

42.7° C

b.

45° C

c.

39.65° C

d.

48.70° C

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