# NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1418 - 1422 of 2142

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## Question number: 1418

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: 1419

MCQ▾

### Question

A constant volume gas thermometer shows pressure reading of 50 cm and 90 cm of mercury at 0°C and 100°C respectively. When the pressure reading is 60 cm of mercury, the temperature is

### Choices

Choice (4) Response

a.

40°C

b.

25°C

c.

15°C

d.

12.5°C

## Passage

In a Young’s double slit experiment a monochromatic light whose wavelength is λ strikes on the slits, separated by distance d, as shown in the figure. Refractive index of the medium between slits and screen varies with time t as . Here n 0 and k are positive constants. Position of any point P on screen is measure by its -coordinate as shown.

## Question number: 1420 (1 of 3 Based on Passage) Show Passage

MCQ▾

### Question

The y co-ordinate of central maxima at any time t is,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1421 (2 of 3 Based on Passage) Show Passage

MCQ▾

### Question

If a glass plate of small thickness b is placed in front of S 1. How should its refractive index vary with time so that a central maximum is formed at O?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 1422 (3 of 3 Based on Passage) Show Passage

MCQ▾

### Question

The velocity of central maxima at any time t as a function of time t is

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page