Physics Crash Course NDA & NA EE>Chapter 16 - Sound Waves>Exercise 1>Q 28

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IMPORTANT

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Two engines pass each other moving in opposite directions with uniform speed of 30 m/s. one of them is blowing a whistle of frequency 540 Hz. Calculate the frequency heard by driver of second engine before they pass each other. speed of sound is 330 m/sec:

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Important Questions on Sound Waves

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 16 - Sound Waves>Exercise 1>Q 1

When a sound wave is reflected from the boundary of a denser medium, the compression of the incident wave is returned as:

EASY

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 16 - Sound Waves>Exercise 1>Q 2

A uniform thin rope of length

12 m

and mass

6 kg

hangs vertically from a rigid support and a block of mass

2 kg

is attached to its free end. A transverse short wave train of wavelength

6 cm

is produced at the lower and the rope. What is the wavelength of the wave train (in

cm

) when it reaches the top of the rope?

EASY

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 16 - Sound Waves>Exercise 1>Q 3

The displacement of an elastic wave is given by the function

y = 3 s i n ω t + 4 \cos ω t,

where

y

is in

c m

and

t

is in

s

. The resultant amplitude is:

EASY

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 16 - Sound Waves>Exercise 1>Q 4

Equation of progressive wave is given by

y = a sinπ (\frac{t}{2} - \frac{x}{4})

, where

t

is in

second

and

x

is in

metre

. Then the distance through which the wave moves in

4 s

is

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 16 - Sound Waves>Exercise 1>Q 5

The equation of a progressive wave is,

y = 0.02 \sin 2 π [\frac{t}{0.01} - \frac{x}{0.3}]

where,

x

and

y

are in

meters

and

t

is in

second

. The velocity of propagation of the wave is,

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 16 - Sound Waves>Exercise 1>Q 6

Which of the following has the minimum frequency?

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 16 - Sound Waves>Exercise 1>Q 7

A simple harmonic oscillator has an amplitude

a

and time period

T .

The time required by it to travel from

x = a

to

x = \frac{a}{2}

is

EASY

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IMPORTANT

Physics Crash Course NDA & NA EE>Chapter 16 - Sound Waves>Exercise 1>Q 8

The velocity factor of a transmission line

x,

if dielectric constant of the medium is

2.6,

the value of

x

is