Sound Test

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Sound Test - 59

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Weekly Quiz Competition

Question 1
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A man produces sound with a trumpet. A wave has a wavelength of 8.75 mm and a frequency of 40kHz. If the man receives an echo after reflecting from the wall 0.4 s later. Calculate the distance between man and the wall.

A
35 m

B
70 m

C
105 m

D
140 m

E
175 m

Solution

Given : $$t =0.4$$ s $$\nu = 40 $$ kHz $$ = 40000$$ Hz $$\lambda =8.75mm = 0.00875$$ $$m$$
$$\therefore$$ Speed of sound $$v = \nu \lambda = 40000 \times 0.00875 = 350$$ m/s
Let the distance between the man and the wall be $$x$$.
Thus sound wave has to travel $$2x$$ distance in 0.4 s so that the man hears an echo.
$$\therefore$$ $$2x = vt$$
OR $$2x = 350 \times 0.4$$ $$\implies x =70$$ m
Question 2
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A tuning fork makes $$256$$ $$vibrations/s$$ in air. When velocity of sound in air is $$330 {m}/{s}$$, then the wavelength of tone emitted is

A
$$1.29 m$$

B
$$2.1 m$$

C
$$0.5 m$$

D
$$0.9 m$$

Solution

We know
$$v=n\lambda$$
Where
$$v$$ is speed of sound.
$$n$$ is frequency.
$$\lambda$$ is wavelength.
Given
$$n=256vibrations/s=256Hz$$
$$v=330m/s$$
$$330=256\times \lambda$$
$$\lambda=\dfrac{330}{256}=1.29m$$
Question 3
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The loudness and pitch of a sound note depend on :

A
intensity and velocity

B
frequency and velocity

C
intensity and frequency

D
frequency and number of harmonics

Solution

Pitch is a term used to describe how high or low a note being played by a musical instrument or sung seems to be. It is dependent upon the frequency of source of sound.

Loudness depends upon the amplitude of sound wave. Thus it depends upon its intensity.
The larger the amplitude the more energy the sound wave contains therefore the louder the sound.
Question 4
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Identify the type of waves generated by you when you are jumping with jumping ropes.

A
transverse

B
S waves

C
longitudinal

D
seismic

E
P waves

Solution

Waves in jumping rope are transverse waves since the displacement of each point in the rope is perpendicular to the direction of energy propagation.
Question 5
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Which of the following represent the distance between two consecutive compressions of a longitudinal wave?

A
Wavelength

B
Amplitude

C
Frequency

D
Speed

E
Time period

Solution

A longitudinal wave is one in which the displacement of the medium is in the same direction as, or the opposite direction to, the direction of travel of the wave. The waves move with compressions and rarefactions along itself. The distance between two consecutive compressions or rarefaction is called the wavelength of the wave.
Question 6
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One sound wave strikes a person's ear every 1/100 of second. The speed of the sound where the person is located is 345 m/s. What is the frequency of the sound?

A
3.45 Hz

B
34.500 Hz

C
0.01 Hz

D
100 Hz

E
2.9 Hz

Solution

Time period of wave of striking the person's ear $$T = \dfrac{1}{100} = 0.01$$ second
Thus frequency of the sound wave $$\nu = \dfrac{1}{T} = \dfrac{1}{0.01} = 100$$ Hz
Question 7
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Identify the type of sound wave.

A
Electromagnetic wave

B
Longitudinal wave

C
Transverse wave

D
Torsional wave

E
Circular wave

Solution

Sound waves are longitudinal waves, that is, they travel by forming compressions and rarefactions from the particles present in the medium through which they travel.
A pictorial representation of the waves is as shown in the figure.
The denser regions are called compressions, and the lighter regions are called rarefactions.
Question 8
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One sound wave strikes a person's ear every $$1/100$$ of a second. The speed of sound where the person is located is $$345 m/s$$.
What is the frequency of the sound?

A
$$3.45\ Hz$$

B
$$34,500\ Hz$$

C
$$0.01\ Hz$$

D
$$100\ Hz$$

E
$$2.9\ Hz$$

Solution

Time period of sound wave $$T = \dfrac{1}{100}$$ second

$$\therefore$$ Frequency of sound wave $$\nu = \dfrac{1}{T} =100$$ $$Hz$$
Question 9
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Directions For Questions

In below shown figure, a glass tank of length 9 meters is filled with waters. a longitudinal wave moving through water as shown in figure. The frequency of the wave is 500 Hz.

...view full instructions

This wave could be which of the following types of waves?

A
Visible light

B
Radio wave

C
Microwave

D
Sound wave

E
X-ray

Solution

Sound is the only longitudinal wave listed. All of the other waves listed are transverse.
Question 10
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A device which is used to find the depth of sea is called:

A
RADAR

B
SONAR

C
ECHO

D
None of these

Solution

SONAR (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels. This technique utilizes ultrasonic waves to estimate and measure the distance, direction and speed of objects underwater.

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Re-Attempt Weekly Quiz Competition

Sound Test - 59

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Sound Test - 59

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SHARING IS CARING

Question 1

35 m

70 m

105 m

140 m

175 m

Solution

Question 2

$$1.29 m$$

$$2.1 m$$

$$0.5 m$$

$$0.9 m$$

Solution

Question 3

intensity and velocity

frequency and velocity

intensity and frequency

frequency and number of harmonics

Solution

Question 4

transverse

S waves

longitudinal

seismic

P waves

Solution

Question 5

Wavelength

Amplitude

Frequency

Speed

Time period

Solution

Question 6

3.45 Hz

34.500 Hz

0.01 Hz

100 Hz

2.9 Hz

Solution

Question 7

Electromagnetic wave

Longitudinal wave

Transverse wave

Torsional wave

Circular wave

Solution

Question 8

$$3.45\ Hz$$

$$34,500\ Hz$$

$$0.01\ Hz$$

$$100\ Hz$$

$$2.9\ Hz$$

Solution

Question 9

Visible light

Radio wave

Microwave

Sound wave

X-ray

Solution

Question 10

RADAR

SONAR

ECHO

None of these

Solution

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