Oscillations and Waves-Harmonics (NEET Physics): Questions 1 - 6 of 6

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Question number: 1

» Oscillations and Waves » Harmonics

MCQ▾

Question

The loudness and the pitch of a sound depends on

Choices

Choice (4) Response
a.

Intensity and frequency

b.

Frequency and velocity

c. Intensity and velocity
d.

Frequency and number of harmonics

Question number: 2

» Oscillations and Waves » Harmonics

MCQ▾

Question

A string on a musical instrument is 70 cm long and its fundamental frequency is 235 Hz. If the desired frequency of 950 Hz, is to be produced, the required length of the string is

Choices

Choice (4) Response
a.

22.7 cm

b.

12.3 cm

c.

17.3 cm

d.

16.5 cm

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 f0=2.87×104s . Here s is thickness of the plate and density of quartz is 2658.76 kg/m 3.

Question number: 3 (1 of 2 Based on Passage) Show Passage

» Oscillations and Waves » Harmonics

MCQ▾

Question

Young’s modulus of elasticity for quartz is -

Choices

Choice (4) Response
a.

8.76 ⨯ 10 12 N/m 2

b.

7 ⨯ 10 11 N/m 2

c.

2 ⨯ 10 12 N/m 2

d.

Information insufficient

Question number: 4 (2 of 2 Based on Passage) Show Passage

» Oscillations and Waves » Harmonics

MCQ▾

Question

If the quartz plate is vibrating in 3 rd harmonic while measuring the frequency of 1.2 ⨯ 10 6 Hz, then the thickness of the plate is,

Choices

Choice (4) Response
a.

7.175 cm

b.

0.07 cm

c.

6.02 cm

d.

71.75cm

Question number: 5

» Oscillations and Waves » Harmonics

MCQ▾

Question

A string on a musical instrument is 50 cm long and its fundamental frequency is 270 Hz. If the desired frequency of 1000 Hz, is to be produced, the required length of the string is

Choices

Choice (4) Response
a.

10.3 cm

b.

13.5 cm

c.

5.4 cm

d.

2.7 cm

Question number: 6

» Oscillations and Waves » Harmonics

MCQ▾

Question

A standing wave having 3 nodes and 2 antinodes is formed between two atoms having a distance 1.21 A between them. The wavelength of the standing wave is

Choices

Choice (4) Response
a.

6.05 Å

b.

1.21 Å

c.

2.42 Å

d.

3.63 Å

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