Dual Nature of Matter and Radiation (NEET Physics): Questions 11 - 16 of 33

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Question number: 11

» Dual Nature of Matter and Radiation » De-Broglie Relation

MCQ▾

Question

One electron & one proton have equal energies then ratio of associated de-Broglie wavelength will be,

Choices

Choice (4) Response

a.

1836:1

b.

(1836)2:1

c.

1:(1836)2

d.

1836:1

Question number: 12

» Dual Nature of Matter and Radiation » De-Broglie Relation

MCQ▾

Question

A hydrogen atom moving at a speed v absorbs a photon of wavelength 122 nm and stops. Find the value of v. (Mass of hydrogen atom = 1.67 × 10 -27 kg)

Choices

Choice (4) Response

a.

3.05 m/s

b.

3.5 m/s

c.

32.5 m/s

d.

3.25 m/s

Question number: 13

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

Assertion-Reason▾

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 but Ꭱ is NOT the correct explanation of Ꭺ

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true

Question number: 14

» Dual Nature of Matter and Radiation » De-Broglie Relation

MCQ▾

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.

0.061 Å

b.

0.6 Å

c.

0.61 Å

d.

0.06 Å

Question number: 15

» Dual Nature of Matter and Radiation » De-Broglie Relation

MCQ▾

Question

de-Broglie wavelength of an electron is 10 Å then velocity will be

Choices

Choice (4) Response

a.

7.2 × 10 7 m/s

b.

7.2 × 10 6 m/s

c.

7.2 × 10 4 m/s

d.

7.2 × 10 5 m/s

Question number: 16

» Dual Nature of Matter and Radiation » De-Broglie Relation

MCQ▾

Question

Energy of an α-particle, having de-Broglie wavelength of 0.004 Å is approximately.

Choices

Choice (4) Response

a.

1275 eV

b.

1200 KeV

c.

1200 GeV

d.

1200 MeV

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