NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1172 - 1175 of 2320

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Question number: 1172

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

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MCQ▾

Question

The separation between Bragg’s planes in a crystal is 10 Å. Then the wavelength of those X-rays which can be diffracted by this crystal is-

(1) 5 Å (2) 10 Å

(3) 20 Å (4) 25 Å

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

Choices

Choice (4)Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1,2 and 3 are correct

Question number: 1173

» Properties of Solids & Liquids » Heat Transfer » Radiation

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MCQ▾

Question

An ice box used for keeping eatable cold has a total wall, area of 1 meter 2 and a wall thickness of 5.0 cm. The thermal conductivity of the ice box is K = 0.01 joule/meter °C is filled with ice at 0° C along with eatables on a day when the temperature is 30°C. The latent heat of fusion of ice is 334 × 10 3 joules/kg. The amount of ice melted in one day is (1 day = 86,400 seconds)

Choices

Choice (4)Response

a.

11520 gm

b.

7760 gm

c.

1552 gm

d.

776 gm

Question number: 1174

» Wave Optics » Interference

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MCQ▾

Question

The equation of two light waves are , . The ratio of maximum to minimum intensities produced by the superposition of these waves will be

Choices

Choice (4)Response

a.

1: 49

b.

49: 1

c.

7: 1

d.

1: 7

Question number: 1175

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

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MCQ▾

Question

An electromagnetic radiation of frequency 3 × 10 15 cycles per second falls on a photo electric surface whose work function is 4.0 eV Find out the maximum velocity of the photo electrons emitted by the surface-

Choices

Choice (4)Response

a.

13.4 × 10 -19 m/s

b.

19.8 × 10 -19 m/s

c.

1.73 × 10 6 m/s

d.

All of the above

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