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The humidity in coastal areas is usually than that of the inland areas.

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Important Questions on Air

MEDIUM

Science>Chemistry>Air>Presence of Water Vapour in Air

A bomb explodes at time

t = 0

in a uniform, isotropic medium of density

ρ

and releases energy

E

, generating a spherical blast wave. The radius

R

of this blast wave varies with time

t

EASY

Science>Chemistry>Air>Presence of Water Vapour in Air

Two waves of sound of wavelength

1.2 m

and

1.25 m

in a medium produce

90

beats in

10 s .

The speed of sound in the medium is

MEDIUM

Science>Chemistry>Air>Presence of Water Vapour in Air

Consider a gas with molar mass

M .

If the sound at frequency

f

is introduced to a tube of this gas at temperature

T

then an internal acoustic standing wave is set up with nodes separated by

L .

The adiabatic constant

(γ = \frac{C_{p}}{C_{v}})

EASY

Science>Chemistry>Air>Presence of Water Vapour in Air

When sound travels from air to water the quantity that remains unchanged is

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Science>Chemistry>Air>Presence of Water Vapour in Air

Sound waves of wavelength

λ

and velocity

v

in medium-

1

enter medium-

2

. If their velocity in medium-

2

4 v

, the wavelength in medium-

2

EASY

Science>Chemistry>Air>Presence of Water Vapour in Air

The velocity of sound in air is independent of change in

MEDIUM

Science>Chemistry>Air>Presence of Water Vapour in Air

A sound wave of frequency

200 Hz

is travelling in air. The speed of sound in the air is

340 m s^{- 1} .

What is the phase difference at a given instant between two points separated by a distance of

85 cm

along the direction of propagation?

EASY

Science>Chemistry>Air>Presence of Water Vapour in Air

Sound travels fastest in

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Science>Chemistry>Air>Presence of Water Vapour in Air

It takes

2.0

seconds for a sound wave to travel between two fixed points when the day temperature is

10 ° C

. If the temperature rises to

30 ° C

, the sound wave travels between the same fixed parts in

EASY

Science>Chemistry>Air>Presence of Water Vapour in Air

A hospital uses an ultrasonic scanner to locate tumors in a tissue. The operating frequency of the scanner is

4.2 MHz .

The speed of sound in a tissue is

1.7 km / s .

The wavelength of sound in the tissue is

HARD

Science>Chemistry>Air>Presence of Water Vapour in Air

A person in front of a mountain is beating a drum at the rate of

40

per minute and hears no distinct echo. If the person moves

90 m

closer to the mountain, he has to beat the drum at

60

per minute to not hear any distinct echo. The speed of sound is

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Science>Chemistry>Air>Presence of Water Vapour in Air

A tunning fork of frequency

480 H z

is used in an experiment for measuring speed of sound

(v)

in air by resonance tube method. Resonance is observed to occur at two successive lengths of the air column,

l_{1} = 30 c m

and

l_{2} = 70 c m .

Then,

ν

is equal to:

MEDIUM

Science>Chemistry>Air>Presence of Water Vapour in Air

Let the speed of sound at

0 ° C

332 {m s}^{- 1}

. On a winter day sound travels

342 m

in one second. The atmospheric temperature on that day is

MEDIUM

Science>Chemistry>Air>Presence of Water Vapour in Air

The pressure wave,

P = 0.01 \sin [1000 t - 3 x] N m^{- 2}

, corresponds to the sound produced by a vibrating blade on a day when atmospheric temperature is

0 ° C

. On some other day when temperature is

T

, the speed of sound produced by the same blade and at the same frequency is found to be

336 m s^{- 1}

. Approximate value of

T

is:

MEDIUM

Science>Chemistry>Air>Presence of Water Vapour in Air

Consider a system of gas of a diatomic molecule in which the speed of sound at

0^{o} C

1260 m s^{- 1}

. Then, the molecular weight of the gas is in

g {mol}^{- 1}

, (given, the gas constant

R

8 .314 J {mol}^{- 1} K^{- 1}

)

EASY

Science>Chemistry>Air>Presence of Water Vapour in Air

Amount of water vapour present in the air is called _____ (moisture / humidity).

EASY

Science>Chemistry>Air>Presence of Water Vapour in Air

_____ present in air is called humidity. (Water Vapour/ Ice)

MEDIUM

Science>Chemistry>Air>Presence of Water Vapour in Air

_____ is the amount of water vapour in the air.

EASY

Science>Chemistry>Air>Presence of Water Vapour in Air

The humidity in coastal areas is usually_____(greater / less) than that of the inland areas.

MEDIUM

Science>Chemistry>Air>Presence of Water Vapour in Air

The amount of water vapour present in the air at a given time _____.

The humidity in coastal areas is usually than that of the inland areas.

Important Questions on Air

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