Dual Nature of Matter and Radiation (NEET Physics): Questions 25 - 29 of 33

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Question number: 25

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

Assertion-Reason▾

Assertion (Ꭺ)

The de-Broglie wavelength of a molecule varies inversely as the square root of temperature.

Reason (Ꭱ)

The root mean square velocity of the molecule is proportional to square root of absolute temperature.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

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

d.

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

Question number: 26

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

MCQ▾

Question

Slope of V0ν curve is-

(Where, V 0 = Stopping potential and ν = frequency)

Choices

Choice (4) Response

a.

he

b.

h

c.

e

d.

ϕ0

Question number: 27

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

MCQ▾

Question

The work function for the surface of aluminum is 4.2 eV. What will be the wavelength of that incident light for which the stopping potential will be 0? (h = 6.6 ×10 -34 J-s, e = 1.6 × 10 -19)

Choices

Choice (4) Response

a.

2946 Å

b.

2496 Å

c.

2649 Å

d.

2946 × 10 -7 m

Question number: 28

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

MCQ▾

Question

The ratio of wavelength of deuteron & proton accelerated by an equal potential is,

Choices

Choice (4) Response

a.

12

b.

21

c.

21

d.

12

Passage

A physicist wishes to eject electrons by shining light on a metal surface. The light source emits light of wavelength of 450 nm. The table lists the only available metals and their work functions.

List of metals and their work function

In above table lists of available metals and their work function is given

Metal

W 0 (eV)

Barium

2.5

Lithium

2.3

Tantalum

4.2

Tungsten

4.5

Question number: 29 (1 of 3 Based on Passage) Show Passage

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

MCQ▾

Question

Which metal (s) can be used to produce electrons by the photoelectric effect from given source of light?

Choices

Choice (4) Response

a.

Lithium, tantalum or tungsten

b.

Barium or lithium

c.

Tungsten or tantalum

d.

Barium only

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