NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1796 - 1800 of 5119

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Passage

A plate was cut from a quartz crystal and is used to control the frequency of an oscillating electrical circuit. Longitudinal standing waves are set up in the plate with displacement antinodes at opposite faces.

The fundamental frequency of vibration is given by the equation . Here s is thickness of the plate and density of quartz is 2658.76 kg/m3 .

Question 1796 (2 of 2 Based on Passage)

Question MCQ▾

If the quartz plate is vibrating in 3rd harmonic while measuring the frequency of 1.2 ⨯ 106 Hz, then the thickness of the plate is,

Choices

Choice (4)Response

a.

71.75cm

b.

0.07 cm

c.

7.175 cm

d.

6.02 cm

Edit

Question 1797

Question MCQ▾

Two whistles A and B produce notes of frequencies 660 Hz and 596 Hz respectively. There is a listener at the midpoint of the line joining them. Now the whistle B and the listener start moving with speed 30 m/s away from the whistle A. If speed of sound be 330 m/s, how many beats will be heard by the listener?

Choices

Choice (4)Response

a.

4

b.

6

c.

8

d.

2

Edit

Question 1798

Question MCQ▾

The phenomenon by which light travels in an optical fibers

Choices

Choice (4)Response

a.

Total internal reflection

b.

Transmission

c.

Re-reflection

d.

Refraction

Edit

Question 1799

Question MCQ▾

A satellite has to revolve round the earth in a circular orbit of radius 8 ⨯ 103 km. The velocity of projection of the satellite in this orbit will be -

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 1800

Question MCQ▾

A whistle sends out 256 waves in a second. If the whistle approaches the observer with velocity of the velocity of sound in air, the number of waves per second the observer will receive,

Choices

Choice (4)Response

a.

384

b.

192

c.

300

d.

200

Edit