NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1379 - 1382 of 2320

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Question number: 1379

» Dual Nature of Matter and Radiation » Particle Nature of Light

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MCQ▾

Question

In a photo-emissive cell with exciting wavelength λ, the fastest electron has speed V. If the exciting wavelength is changed to , the speed of the fastest emitted electron will be

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 1380

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

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MCQ▾

Question

Electrons are accelerated in television tubes through potential difference of about 10 KV

(1) The lowest wavelength of the emitted X-rays is 12.4A

(2) The lowest wavelength of the emitted X-rays is 1.24 A

(3) The highest frequency of the emitted X-rays is 2.4 × 10 8 Hz

(4) The highest frequency of the emitted X-rays is 2.4 × l0 18 Hz

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.

1,2 and 3 are correct

d.

1 and 3 are correct

Question number: 1381

» Properties of Solids & Liquids » Surface Energy and Surface Tension

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MCQ▾

Question

Two soap bubbles of radii r 1 and r 2 equal to 8 cm and 9 cm are touching each other over a common surface S 1 S 2. Its radius will be

Choices

Choice (4)Response

a.

45 cm

b.

20 cm

c.

72 cm

d.

58 cm

Question number: 1382

» Properties of Solids & Liquids » Elastic Behavior

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MCQ▾

Question

A brass rod is to support a load of 500 N. If its elastic limit is 5.0 × l0 8 N/m 2 its minimum diameter must be -

Choices

Choice (4)Response

a.

3.71mm

b.

1.13mm

c.

2.26mm

d.

1.26mm

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