173111 A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer. The frequency (n) of sound heard by the observer is plotted against time (t). Which of the following graphs represents the correct variation?

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173112 A table is revolving about a vertical axis passing through its centre at 5 revolutions per sec. A sound source of frequency $1000 \mathrm{~Hz}$ is fixed on the table at $70 \mathrm{~cm}$ away from the axis and is also revolving with the table. The maximum apparent frequency heard by listener standing away from the table will be (speed of sound $=332 \mathrm{~m} / \mathrm{s}$ )

173113 The frequency of a train whistle is $360 \mathrm{~Hz}$. As the train passes through a station the frequency appears to be $400 \mathrm{~Hz}$ to a man who is standing on the station platform. If the speed of sound in air is $340 \mathrm{~m} / \mathrm{s}$, the speed of train is

173114 An object producing a pitch of $1200 \mathrm{~Hz}$ is moving with a velocity of $50 \mathrm{~m} / \mathrm{s}$ towards a stationary person. The velocity of sound is $\mathbf{3 5 0}$ $\mathrm{m} / \mathrm{s}$. The frequency of sound heard by the stationary person is :

173115 A sound wave of frequency $f$ propagating through air with a velocity $c$, is reflected from a surface which is moving away from the source with a constant speed $v$. The frequency of the reflected wave, measured by the observer at the position of the source, is :

173111 A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer. The frequency (n) of sound heard by the observer is plotted against time (t). Which of the following graphs represents the correct variation?

1

2

3

4

173112 A table is revolving about a vertical axis passing through its centre at 5 revolutions per sec. A sound source of frequency $1000 \mathrm{~Hz}$ is fixed on the table at $70 \mathrm{~cm}$ away from the axis and is also revolving with the table. The maximum apparent frequency heard by listener standing away from the table will be (speed of sound $=332 \mathrm{~m} / \mathrm{s}$ )

173113 The frequency of a train whistle is $360 \mathrm{~Hz}$. As the train passes through a station the frequency appears to be $400 \mathrm{~Hz}$ to a man who is standing on the station platform. If the speed of sound in air is $340 \mathrm{~m} / \mathrm{s}$, the speed of train is

173114 An object producing a pitch of $1200 \mathrm{~Hz}$ is moving with a velocity of $50 \mathrm{~m} / \mathrm{s}$ towards a stationary person. The velocity of sound is $\mathbf{3 5 0}$ $\mathrm{m} / \mathrm{s}$. The frequency of sound heard by the stationary person is :

173115 A sound wave of frequency $f$ propagating through air with a velocity $c$, is reflected from a surface which is moving away from the source with a constant speed $v$. The frequency of the reflected wave, measured by the observer at the position of the source, is :

173111 A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer. The frequency (n) of sound heard by the observer is plotted against time (t). Which of the following graphs represents the correct variation?

1

2

3

4

173112 A table is revolving about a vertical axis passing through its centre at 5 revolutions per sec. A sound source of frequency $1000 \mathrm{~Hz}$ is fixed on the table at $70 \mathrm{~cm}$ away from the axis and is also revolving with the table. The maximum apparent frequency heard by listener standing away from the table will be (speed of sound $=332 \mathrm{~m} / \mathrm{s}$ )

173113 The frequency of a train whistle is $360 \mathrm{~Hz}$. As the train passes through a station the frequency appears to be $400 \mathrm{~Hz}$ to a man who is standing on the station platform. If the speed of sound in air is $340 \mathrm{~m} / \mathrm{s}$, the speed of train is

173114 An object producing a pitch of $1200 \mathrm{~Hz}$ is moving with a velocity of $50 \mathrm{~m} / \mathrm{s}$ towards a stationary person. The velocity of sound is $\mathbf{3 5 0}$ $\mathrm{m} / \mathrm{s}$. The frequency of sound heard by the stationary person is :

173115 A sound wave of frequency $f$ propagating through air with a velocity $c$, is reflected from a surface which is moving away from the source with a constant speed $v$. The frequency of the reflected wave, measured by the observer at the position of the source, is :

173111 A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer. The frequency (n) of sound heard by the observer is plotted against time (t). Which of the following graphs represents the correct variation?

1

2

3

4

173112 A table is revolving about a vertical axis passing through its centre at 5 revolutions per sec. A sound source of frequency $1000 \mathrm{~Hz}$ is fixed on the table at $70 \mathrm{~cm}$ away from the axis and is also revolving with the table. The maximum apparent frequency heard by listener standing away from the table will be (speed of sound $=332 \mathrm{~m} / \mathrm{s}$ )

173113 The frequency of a train whistle is $360 \mathrm{~Hz}$. As the train passes through a station the frequency appears to be $400 \mathrm{~Hz}$ to a man who is standing on the station platform. If the speed of sound in air is $340 \mathrm{~m} / \mathrm{s}$, the speed of train is

173114 An object producing a pitch of $1200 \mathrm{~Hz}$ is moving with a velocity of $50 \mathrm{~m} / \mathrm{s}$ towards a stationary person. The velocity of sound is $\mathbf{3 5 0}$ $\mathrm{m} / \mathrm{s}$. The frequency of sound heard by the stationary person is :

173115 A sound wave of frequency $f$ propagating through air with a velocity $c$, is reflected from a surface which is moving away from the source with a constant speed $v$. The frequency of the reflected wave, measured by the observer at the position of the source, is :

173111 A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer. The frequency (n) of sound heard by the observer is plotted against time (t). Which of the following graphs represents the correct variation?

1

2

3

4

173112 A table is revolving about a vertical axis passing through its centre at 5 revolutions per sec. A sound source of frequency $1000 \mathrm{~Hz}$ is fixed on the table at $70 \mathrm{~cm}$ away from the axis and is also revolving with the table. The maximum apparent frequency heard by listener standing away from the table will be (speed of sound $=332 \mathrm{~m} / \mathrm{s}$ )

173113 The frequency of a train whistle is $360 \mathrm{~Hz}$. As the train passes through a station the frequency appears to be $400 \mathrm{~Hz}$ to a man who is standing on the station platform. If the speed of sound in air is $340 \mathrm{~m} / \mathrm{s}$, the speed of train is

173114 An object producing a pitch of $1200 \mathrm{~Hz}$ is moving with a velocity of $50 \mathrm{~m} / \mathrm{s}$ towards a stationary person. The velocity of sound is $\mathbf{3 5 0}$ $\mathrm{m} / \mathrm{s}$. The frequency of sound heard by the stationary person is :

173115 A sound wave of frequency $f$ propagating through air with a velocity $c$, is reflected from a surface which is moving away from the source with a constant speed $v$. The frequency of the reflected wave, measured by the observer at the position of the source, is :