Alpha Question Bank for Medical: Physics>Chapter 21 - Sound Waves>Exercise-1>Q 2

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A machine gun is mounted on an armoured car moving with a speed of $20 {m s}^{- 1} .$ The gun can point against the direction of motion of the car. The muzzle speed of the bullet is equal to the speed of sound in the air i.e., $340 {m s}^{- 1} .$ The time difference between bullets actually reaching and the sound of firing reaching at a target $500 m$ away from a car at the instant of firing is

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Important Questions on Sound Waves

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Alpha Question Bank for Medical: Physics>Chapter 21 - Sound Waves>Exercise-1>Q 4

A wave enters to water from air. In air frequency, wavelength, intensity and velocity are

n_{1}, λ_{1}, I_{1}

and

v_{1}

, respectively. In water the corresponding quantities are

n_{2}, λ_{2}, I_{2}

and

v_{2}

, respectively. then

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Alpha Question Bank for Medical: Physics>Chapter 21 - Sound Waves>Exercise-1>Q 5

The temperature in

{}^{\circ}C

at which the velocity of sound in air is half its value at

0 ° C

is

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Alpha Question Bank for Medical: Physics>Chapter 21 - Sound Waves>Exercise-1>Q 6

The ratio of speed of sound in neon to that in water vapours at any temperature (when molecular weight of neon is

2.02 \times 10^{- 2} kg {mol}^{- 1}

and for water vapours is

1.8 \times 10^{- 2} kg {mol}^{- 1}

),

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Alpha Question Bank for Medical: Physics>Chapter 21 - Sound Waves>Exercise-1>Q 7

Under similar conditions of temperature and pressure, In which of the following gases the velocity of sound will be largest.

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Alpha Question Bank for Medical: Physics>Chapter 21 - Sound Waves>Exercise-1>Q 8

If

v_{m}

is the velocity of sound in moist air and

v_{d}

is the velocity of sound in dry air, then-

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Alpha Question Bank for Medical: Physics>Chapter 21 - Sound Waves>Exercise-1>Q 9

An earthquake generates both transverse (

S

) and longitudinal (

P

) sound waves in the earth. The speed of

S

waves is about

4.5 km s^{- 1}

and that of

P

waves is about

8.0 km s^{- 1}

. A seismograph records

P

and

S

waves from an earthquake. The first

P

wave arrives

4.0 \min

before the first

S

wave. The epicenter of the earthquake is located at a distance of about,

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Alpha Question Bank for Medical: Physics>Chapter 21 - Sound Waves>Exercise-1>Q 10

On increasing the temperature by

1 ° C

of sound, its velocity increases by

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Alpha Question Bank for Medical: Physics>Chapter 21 - Sound Waves>Exercise-1>Q 11

At which temperature the speed of sound will be three times of its speed at

0 ° C

?