Dual Nature of Matter and Radiation (NEET Physics): Questions 17 - 21 of 33

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Question number: 17

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

MCQ▾

Question

A beam of electron accelerated through 70 kV strikes against a target. Which one of following

X-ray frequency will be missing?

Choices

Choice (4) Response

a.

16.9×1018Hz

b.

6×108Hz

c.

2×109Hz

d.

12×1018Hz

Question number: 18

» Dual Nature of Matter and Radiation » Photoelectric Effect

MCQ▾

Question

Light of wavelength 3320 A is incident on metal surface (work function = 1.07 eV). To stop emission of photo electron, retarding potential required to be

(Take hc = 12420 eV- Å)

Choices

Choice (4) Response

a.

3.74 V

b.

4.81V

c.

2.67 V

d.

1.07 V

Question number: 19

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

MCQ▾

Question

Velocity of a proton is c20 . Associated de-Broglie wavelength is (Take h = 6.626 × 10 -34 J-s)

Choices

Choice (4) Response

a.

2.64 × 10 -14 m

b.

2.64 × 10 -14 A

c.

2.64 × 10 -24 cm

d.

2.64 × 10 -24 mm

Question number: 20

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

Assertion-Reason▾

Assertion (Ꭺ)

Mass of moving photon varies directly as the wavelength.

Reason (Ꭱ)

Energy of the particle = Mass × (Speed of light) 2

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question number: 21

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

MCQ▾

Question

In a photo-emissive cell with exciting wavelength λ, the fastest electron has speed V. If the exciting wavelength is changed to 3λ4 , the speed of the fastest emitted electron will be

Choices

Choice (4) Response

a.

v(34)12

b.

Greaterthanv(43)12

c.

Lessthanv(43)12

d.

v(43)12

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