NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1418 - 1423 of 2142

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Question number: 1418

» 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: 1419

» Properties of Solids & Liquids » Thermal Expansion

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

Read the passage given below and answer the questions that follow:

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.

Young’s double slit experiment

Young’S Double Slit Experiment

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 n = n0 + kt.

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

» Wave Optics » Young's Double Slit Experiment

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.

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

» Wave Optics » Young's Double Slit Experiment

MCQ▾

Question

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

Choices

Choice (4) Response

a.

b.

c.

d.

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

» Wave Optics » Diffraction Due to a Single Slit Width of Central Maximum

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: 1423

» Atoms and Nuclei » Hydrogen Spectrum

MCQ▾

Question

When a hydrogen atom is raised from the ground state to an excited state

Choices

Choice (4) Response

a.

P. E. increases and K. E. decreases

b.

kinetic energy and potential energy increase

c.

K. E. and P. E. decrease

d.

P. E. decreases and K. E. increases

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