ISC Physics Class XI Part 1>Chapter 29 - Wave Motion>NUMERICALS>Q 5

MEDIUM

11th ICSE

IMPORTANT

Earn 100

For steel the Young's modulus of elasticity is $2.9 x 10^{11} N m^{- 2}$ and density is $8 x 10^{3} kg m^{- 3}$ . Find the velocity of the longitudinal waves in steel.

Important Questions on Wave Motion

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 29 - Wave Motion>NUMERICALS>Q 6

The speed of sound in a liquid is

1500 m s^{- 1}

. The density of the liquid is

1.0 \times 10^{3} kg m^{- 3}

. Determine the bulk modulus of elasticity of the liquid.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 29 - Wave Motion>NUMERICALS>Q 7

The longitudinal waves starting from a ship returns from the bottom of the sea to the ship after

2.64

\sec

. If the bulk modulus of water be

220 N m^{- 2}

and the density

1.1 x 10^{3} kg m^{- 3}

then calculate the depth of the sea.

(g = 9.8 {ms}^{- 2})

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 29 - Wave Motion>NUMERICALS>Q 8

At

10^{5} N m^{- 2}

atmospheric pressure, the density of air is

1.29 kg m^{- 3}

. If

γ = 1.41

for air, then calculate the speed of sound in air.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 29 - Wave Motion>NUMERICALS>Q 9

At normal temperature and pressure,

1 mole (= 4 g)

of helium encloses a volume of

22.4 litre

. Determine the speed of sound in helium. (For helium,

γ = 1.67

,

1 atmospheric pressure = 10^{5} N m^{- 2}

)

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 29 - Wave Motion>NUMERICALS>Q 10

The mass of one litre of hydrogen is

0.0896 g

and that of one litre of air is

1.293 g

. The speed of sound in air is

332 {ms}^{- 1}

. Calculate the speed of sound in hydrogen.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 29 - Wave Motion>NUMERICALS>Q 11

The speed of sound in air is

332 m s^{- 1}

. If the volumes of nitrogen (molecular mass

28

) and oxygen (molecular mass

32

) in air are in the ratio

4 : 1

, then find out the speed of sound in oxygen.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 29 - Wave Motion>NUMERICALS>Q 12

If the speed of sound in helium at

0 ° C

be

960 m s^{- 1}

, then what will be the speed of sound in hydrogen at the same temperature? The values of

γ

for

He

and

H_{2}

are respectively

1.67

and

1.40

and ratio of their molecular masses is

2 : 1

.

HARD

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 29 - Wave Motion>NUMERICALS>Q 13

Find the ratio of the speeds of sound in hydrogen and carbon dioxide at the same temperature. The values of

γ

for

H_{2}

are

C O_{2}

, are

1.4

and

1.3

respectively, and the ratio of their molecular masses is

1 : 22 .