Hydrogen ( 1 H 1 ), Deuterium ( 1 H 2 ), singly ionised Helium ( 2 He 4 ) + and doubly ionised lithium ( 3 Li 6 ) ++ all have one electron around the nucleus. Consider an electron transition from n = 2 to n = 1 . If the wave lengths of emitted radiation are λ 1 , λ 2 , λ 3 and λ 4 respectively then approximately which one of the following is correct ?

4 λ 1 = 2 λ 2 = 2 λ 3 = λ 4

λ 1 = 2 λ 2 = 3 λ 3 = 4 λ 4

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Define the wavelength of a sound wave. How is it related to the frequency and the wave speed?

Important Questions on Sound

EASY

Science>Physics>Sound>Propagation of Sound

If the speed of wave is

250 m / s

and its wavelength is

50 cm

then the frequency will be:

EASY

Science>Physics>Sound>Propagation of Sound

The frequency of radio waves from a certain radio station is

600 KHz

. Its wavelength is

EASY

Science>Physics>Sound>Propagation of Sound

The velocity of sound wave in a given medium is

V

when its frequency is

ν

. The velocity, when the frequency changes to

5 ν

is :

MEDIUM

Science>Physics>Sound>Propagation of Sound

The given graph shows the displacement versus time relation for a disturbance travelling with velocity $1500 m / s$ . The wavelength of the disturbance will be

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HARD

Science>Physics>Sound>Propagation of Sound

A ball is moving uniformly in a circular path of radius

1 m

with a time period of

1.5 s

. If the ball is suddenly stopped at

t = 8.3 s,

the magnitude of the displacement of the ball with respect to its position at

t = 0 s

is closest to:

EASY

Science>Physics>Sound>Propagation of Sound

If the speed of wave is

350 m / s

and its wavelength is

100 cm

then the frequency of the wave will be

MEDIUM

Science>Physics>Sound>Propagation of Sound

Consider the following statements and select the correct alternative: Statement (A): The frequency of the sound wave whose wave length is

1.5 cm

with speed

339 m / s

22600 Hz

. Statement (B): The given sound is audible to human beings.

EASY

Science>Physics>Sound>Propagation of Sound

In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is:

EASY

Science>Physics>Sound>Propagation of Sound

On an average, a human heart is found to beat

72

times a minute. Its frequency and period are

HARD

Science>Physics>Sound>Propagation of Sound

A point particle is acted upon by a restoring force

- k x^{3} .

The time period of oscillation is

T

when the amplitude is

A .

The time period for an amplitude

2 A

will be:

EASY

Science>Physics>Sound>Propagation of Sound

The speed of a wave in a medium is

760 {ms}^{- 1}

.If

3600

waves are passing through a point in the medium in

2

minutes then its wavelength is

EASY

Science>Physics>Sound>Propagation of Sound

A simple wave motion is represented by $y = 5 (\sin 4 π t + \sqrt{3} \cos 4 π t)$ . Its amplitude is

HARD

Science>Physics>Sound>Propagation of Sound

For the wave shown in figure, calculate the frequency and wave length of the wave if its speed is 320 ms–1.

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EASY

Science>Physics>Sound>Propagation of Sound

When sound is refracted from air to water, which of the following will remain unchanged?

EASY

Science>Physics>Sound>Propagation of Sound

Given the value of Rydberg constant is

10^{7} m^{- 1}

, the wave number of the last line of the Balmer series in hydrogen spectrum will be:

EASY

Science>Physics>Sound>Propagation of Sound

The frequency for a series limit of Balmer and Paschen series respectively are

f_{1}

and

f_{3}

. If the frequency of the first line of Balmer series is

f_{2}

then the relation between

f_{1}, f_{2}

and

f_{3}

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Science>Physics>Sound>Propagation of Sound

Hydrogen (₁H¹), Deuterium (₁H²), singly ionised Helium (₂He⁴)⁺ and doubly ionised lithium (₃Li⁶)⁺⁺ all have one electron around the nucleus. Consider an electron transition from

n = 2

n = 1

. If the wave lengths of emitted radiation are

λ_{1}, λ_{2}, λ_{3}

and

λ_{4}

respectively then approximately which one of the following is correct ?

MEDIUM

Science>Physics>Sound>Propagation of Sound

What are acoustically measurable quantities related to pitch and loudness?

MEDIUM

Science>Physics>Sound>Propagation of Sound

A transverse wave travels on a taut steel wire with a velocity of

v

when tension in it is

2.06 \times 10^{4} N .

When the tension is changed to

T,

the velocity changed to

\frac{v}{2} .

The value of

T

is close to:

EASY

Science>Physics>Sound>Propagation of Sound

The figure below shows pressure variation in two different sound waves in air with time at a given position. Both the figures are drawn to the same scale.

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Which of the following statement is true?

Define the wavelength of a sound wave. How is it related to the frequency and the wave speed?

Important Questions on Sound

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