Doppler Effect
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WAVES

173008 A source of sound is approaching an observer with speed of $30 \mathrm{~m} \mathrm{~s}^{-1}$ and the observer is approaching the source with a speed of $60 \mathrm{~ms}^{-1}$. Then the fractional change in the frequency of sound is (speed of sound in air $=330 \mathrm{~m} \mathrm{~s}^{-1}$ )

1 $\frac{1}{3}$
2 $\frac{3}{10}$
3 $\frac{2}{5}$
4 $\frac{2}{3}$
J and K CET- 2010
WAVES

173009 A bat flies at a steady speed at $4 \mathrm{~ms}^{-1}$ emitting a sound of $f=90 \times 10^{3} \mathrm{~Hz}$. It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be (take velocity of sound in air is $330 \mathrm{~ms}^{-1}$ )

1 $88.1 \times 10^{3} \mathrm{~Hz}$
2 $87.1 \times 10^{3} \mathrm{~Hz}$
3 $92.1 \times 10^{3} \mathrm{~Hz}$
4 $89.1 \times 10^{3} \mathrm{~Hz}$
Karnataka CET-2010
WAVES

173011 An observer is approaching a stationary source with a velocity $\frac{1}{4}$ th of the velocity of sound.
Then the ratio of the apparent frequency to actual frequency of source is

1 $4: 5$
2 $5: 4$
3 $2: 3$
4 $3: 2$
5 $2: 5$
Kerala CEE - 2009
WAVES

173012 A bus is moving with a velocity of $5 \mathrm{~ms}^{-1}$ towards a huge wall. The driver sounds a horn of frequency $165 \mathrm{~Hz}$. If the speed of sound in air is $335 \mathrm{~ms}^{-1}$, the number of beats heard per second by passenger inside the bus will be

1 3
2 4
3 5
4 6
5 7
Kerala CEE - 2008
NEET DIGITAL LIBRARY
WAVES

173008 A source of sound is approaching an observer with speed of $30 \mathrm{~m} \mathrm{~s}^{-1}$ and the observer is approaching the source with a speed of $60 \mathrm{~ms}^{-1}$. Then the fractional change in the frequency of sound is (speed of sound in air $=330 \mathrm{~m} \mathrm{~s}^{-1}$ )

1 $\frac{1}{3}$
2 $\frac{3}{10}$
3 $\frac{2}{5}$
4 $\frac{2}{3}$
J and K CET- 2010
WAVES

173009 A bat flies at a steady speed at $4 \mathrm{~ms}^{-1}$ emitting a sound of $f=90 \times 10^{3} \mathrm{~Hz}$. It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be (take velocity of sound in air is $330 \mathrm{~ms}^{-1}$ )

1 $88.1 \times 10^{3} \mathrm{~Hz}$
2 $87.1 \times 10^{3} \mathrm{~Hz}$
3 $92.1 \times 10^{3} \mathrm{~Hz}$
4 $89.1 \times 10^{3} \mathrm{~Hz}$
Karnataka CET-2010
WAVES

173011 An observer is approaching a stationary source with a velocity $\frac{1}{4}$ th of the velocity of sound.
Then the ratio of the apparent frequency to actual frequency of source is

1 $4: 5$
2 $5: 4$
3 $2: 3$
4 $3: 2$
5 $2: 5$
Kerala CEE - 2009
WAVES

173012 A bus is moving with a velocity of $5 \mathrm{~ms}^{-1}$ towards a huge wall. The driver sounds a horn of frequency $165 \mathrm{~Hz}$. If the speed of sound in air is $335 \mathrm{~ms}^{-1}$, the number of beats heard per second by passenger inside the bus will be

1 3
2 4
3 5
4 6
5 7
Kerala CEE - 2008
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WAVES

173008 A source of sound is approaching an observer with speed of $30 \mathrm{~m} \mathrm{~s}^{-1}$ and the observer is approaching the source with a speed of $60 \mathrm{~ms}^{-1}$. Then the fractional change in the frequency of sound is (speed of sound in air $=330 \mathrm{~m} \mathrm{~s}^{-1}$ )

1 $\frac{1}{3}$
2 $\frac{3}{10}$
3 $\frac{2}{5}$
4 $\frac{2}{3}$
J and K CET- 2010
WAVES

173009 A bat flies at a steady speed at $4 \mathrm{~ms}^{-1}$ emitting a sound of $f=90 \times 10^{3} \mathrm{~Hz}$. It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be (take velocity of sound in air is $330 \mathrm{~ms}^{-1}$ )

1 $88.1 \times 10^{3} \mathrm{~Hz}$
2 $87.1 \times 10^{3} \mathrm{~Hz}$
3 $92.1 \times 10^{3} \mathrm{~Hz}$
4 $89.1 \times 10^{3} \mathrm{~Hz}$
Karnataka CET-2010
WAVES

173011 An observer is approaching a stationary source with a velocity $\frac{1}{4}$ th of the velocity of sound.
Then the ratio of the apparent frequency to actual frequency of source is

1 $4: 5$
2 $5: 4$
3 $2: 3$
4 $3: 2$
5 $2: 5$
Kerala CEE - 2009
WAVES

173012 A bus is moving with a velocity of $5 \mathrm{~ms}^{-1}$ towards a huge wall. The driver sounds a horn of frequency $165 \mathrm{~Hz}$. If the speed of sound in air is $335 \mathrm{~ms}^{-1}$, the number of beats heard per second by passenger inside the bus will be

1 3
2 4
3 5
4 6
5 7
Kerala CEE - 2008
For More Updates join with Us
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WAVES

173008 A source of sound is approaching an observer with speed of $30 \mathrm{~m} \mathrm{~s}^{-1}$ and the observer is approaching the source with a speed of $60 \mathrm{~ms}^{-1}$. Then the fractional change in the frequency of sound is (speed of sound in air $=330 \mathrm{~m} \mathrm{~s}^{-1}$ )

1 $\frac{1}{3}$
2 $\frac{3}{10}$
3 $\frac{2}{5}$
4 $\frac{2}{3}$
J and K CET- 2010
WAVES

173009 A bat flies at a steady speed at $4 \mathrm{~ms}^{-1}$ emitting a sound of $f=90 \times 10^{3} \mathrm{~Hz}$. It is flying horizontally towards a vertical wall. The frequency of the reflected sound as detected by the bat will be (take velocity of sound in air is $330 \mathrm{~ms}^{-1}$ )

1 $88.1 \times 10^{3} \mathrm{~Hz}$
2 $87.1 \times 10^{3} \mathrm{~Hz}$
3 $92.1 \times 10^{3} \mathrm{~Hz}$
4 $89.1 \times 10^{3} \mathrm{~Hz}$
Karnataka CET-2010
WAVES

173011 An observer is approaching a stationary source with a velocity $\frac{1}{4}$ th of the velocity of sound.
Then the ratio of the apparent frequency to actual frequency of source is

1 $4: 5$
2 $5: 4$
3 $2: 3$
4 $3: 2$
5 $2: 5$
Kerala CEE - 2009
WAVES

173012 A bus is moving with a velocity of $5 \mathrm{~ms}^{-1}$ towards a huge wall. The driver sounds a horn of frequency $165 \mathrm{~Hz}$. If the speed of sound in air is $335 \mathrm{~ms}^{-1}$, the number of beats heard per second by passenger inside the bus will be

1 3
2 4
3 5
4 6
5 7
Kerala CEE - 2008
NEET DIGITAL LIBRARY