NEET Physics: Questions 1794 - 1799 of 2098

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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: 1794 (2 of 3 Based on Passage) Show Passage

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

MCQ▾

Question

Which option correctly identifies the metal that will produce the most energetic electrons and their energies?

Choices

Choice (4) Response

a.

Lithium, 2.30 eV

b.

Tungsten, 1.75 eV

c.

Lithium, 0.45 eV

d.

Tungsten, 2.75 eV

Question number: 1795 (3 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

Question number: 1796

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

Question

Doppler shift in frequency depends upon

Choices

Choice (4) Response

a.

The velocity of the observer

b.

The frequency of the wave produced

c.

The velocity of the source

d.

All c. , a. and b. are correct

Question number: 1797

» Communication System » Amplitude and Frequency Modulation

MCQ▾

Question

If f a and f f represent the carrier wave frequencies for amplitude and frequency modulations respectively, then

Choices

Choice (4) Response

a.

faff

b.

fa=ff

c.

fa<ff

d.

fa>ff

Question number: 1798

» Gravitation » Kepler's Laws of Planetary Motion

MCQ▾

Question

The mean distance of mars from sun is 1.524 times the distance of the earth from the sun. The period of revolution of mars around sun will be

Choices

Choice (4) Response

a.

3.88 earth year

b.

4.88 earth year

c.

2.88 earth year

d.

1.88 earth year

Question number: 1799

» Gravitation » Energy

MCQ▾

Question

A projectile is fired vertically upward from the surface of earth with a velocity Kvems . where vems is the escape velocity and K < 1. Neglecting air resistance, the maximum height to which it will rise measured from the center of the earth is - (where R = radius of earth)

Choices

Choice (4) Response

a.

1K2R

b.

RK2

c.

K2R

d.

R1K2

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