# Dual Nature of Matter and Radiation (NEET Physics): Questions 25 - 29 of 36

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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 curve is-

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

### Choices

Choice (4) Response

a.

b.

c.

d.

## 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.

b.

c.

d.

## 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.

 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

Suppose photoelectric experiment is done separately with these metals with light of wavelength 450 nm. The maximum magnitude of stopping potential amongst all the metals is-

### Choices

Choice (4) Response

a.

0.45 volt

b.

4.5 volt

c.

2.75 volt

d.

0.25 volt

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