173013 A train is moving at $30 \mathrm{~ms}^{-1}$ in still air. The frequency of the locomotive whistle is $500 \mathrm{~Hz}$ and the speed of sound is $345 \mathrm{~ms}^{-1}$. The apparent wavelength of sound in front of and behind the locomotive are respectively

173014 The apparent frequency of the whistle of an engine changes in the ratio $9: 8$ as the engine passes a stationary observer. If the velocity of the sound is $340 \mathrm{~ms}^{-1}$, then the velocity of the engine is :

173016 A source of sound of frequency $640 \mathrm{~Hz}$ is moving at a velocity of $\frac{100}{3} \mathrm{~m} / \mathrm{s}$ along a road, and is at an instant $30 \mathrm{~m}$ away from a point. A on the road (as shown in figure). A person standing at $\mathrm{O}, 40 \mathrm{~m}$ away from the road hears sound of apparent frequency $v^{\prime}$. The value of $v^{\prime}$ is (velocity of sound $=340 \mathrm{~m} / \mathrm{s}$ )

173017 A whistle with frequency $1020 \mathrm{~Hz}$ is blown at a station. A man travelling in a train moving towards the station at $30 \mathrm{~m} / \mathrm{s}$ hears the sound of the whistle. If the speed of sound is $340 \mathrm{~m} / \mathrm{s}$, the apparent frequency heard by him is

173019 A car sounding its horn at $480 \mathrm{~Hz}$ moves towards a high wall at a speed of $20 \mathrm{~ms}^{-1}$. If the speed of sound is $340 \mathrm{~ms}^{-1}$, the frequency of the reflected sound heard by the girl sitting in the car will be closest to

173013 A train is moving at $30 \mathrm{~ms}^{-1}$ in still air. The frequency of the locomotive whistle is $500 \mathrm{~Hz}$ and the speed of sound is $345 \mathrm{~ms}^{-1}$. The apparent wavelength of sound in front of and behind the locomotive are respectively

173014 The apparent frequency of the whistle of an engine changes in the ratio $9: 8$ as the engine passes a stationary observer. If the velocity of the sound is $340 \mathrm{~ms}^{-1}$, then the velocity of the engine is :

173016 A source of sound of frequency $640 \mathrm{~Hz}$ is moving at a velocity of $\frac{100}{3} \mathrm{~m} / \mathrm{s}$ along a road, and is at an instant $30 \mathrm{~m}$ away from a point. A on the road (as shown in figure). A person standing at $\mathrm{O}, 40 \mathrm{~m}$ away from the road hears sound of apparent frequency $v^{\prime}$. The value of $v^{\prime}$ is (velocity of sound $=340 \mathrm{~m} / \mathrm{s}$ )

173017 A whistle with frequency $1020 \mathrm{~Hz}$ is blown at a station. A man travelling in a train moving towards the station at $30 \mathrm{~m} / \mathrm{s}$ hears the sound of the whistle. If the speed of sound is $340 \mathrm{~m} / \mathrm{s}$, the apparent frequency heard by him is

173019 A car sounding its horn at $480 \mathrm{~Hz}$ moves towards a high wall at a speed of $20 \mathrm{~ms}^{-1}$. If the speed of sound is $340 \mathrm{~ms}^{-1}$, the frequency of the reflected sound heard by the girl sitting in the car will be closest to

173013 A train is moving at $30 \mathrm{~ms}^{-1}$ in still air. The frequency of the locomotive whistle is $500 \mathrm{~Hz}$ and the speed of sound is $345 \mathrm{~ms}^{-1}$. The apparent wavelength of sound in front of and behind the locomotive are respectively

173014 The apparent frequency of the whistle of an engine changes in the ratio $9: 8$ as the engine passes a stationary observer. If the velocity of the sound is $340 \mathrm{~ms}^{-1}$, then the velocity of the engine is :

173016 A source of sound of frequency $640 \mathrm{~Hz}$ is moving at a velocity of $\frac{100}{3} \mathrm{~m} / \mathrm{s}$ along a road, and is at an instant $30 \mathrm{~m}$ away from a point. A on the road (as shown in figure). A person standing at $\mathrm{O}, 40 \mathrm{~m}$ away from the road hears sound of apparent frequency $v^{\prime}$. The value of $v^{\prime}$ is (velocity of sound $=340 \mathrm{~m} / \mathrm{s}$ )

173017 A whistle with frequency $1020 \mathrm{~Hz}$ is blown at a station. A man travelling in a train moving towards the station at $30 \mathrm{~m} / \mathrm{s}$ hears the sound of the whistle. If the speed of sound is $340 \mathrm{~m} / \mathrm{s}$, the apparent frequency heard by him is

173019 A car sounding its horn at $480 \mathrm{~Hz}$ moves towards a high wall at a speed of $20 \mathrm{~ms}^{-1}$. If the speed of sound is $340 \mathrm{~ms}^{-1}$, the frequency of the reflected sound heard by the girl sitting in the car will be closest to

173013 A train is moving at $30 \mathrm{~ms}^{-1}$ in still air. The frequency of the locomotive whistle is $500 \mathrm{~Hz}$ and the speed of sound is $345 \mathrm{~ms}^{-1}$. The apparent wavelength of sound in front of and behind the locomotive are respectively

173014 The apparent frequency of the whistle of an engine changes in the ratio $9: 8$ as the engine passes a stationary observer. If the velocity of the sound is $340 \mathrm{~ms}^{-1}$, then the velocity of the engine is :

173016 A source of sound of frequency $640 \mathrm{~Hz}$ is moving at a velocity of $\frac{100}{3} \mathrm{~m} / \mathrm{s}$ along a road, and is at an instant $30 \mathrm{~m}$ away from a point. A on the road (as shown in figure). A person standing at $\mathrm{O}, 40 \mathrm{~m}$ away from the road hears sound of apparent frequency $v^{\prime}$. The value of $v^{\prime}$ is (velocity of sound $=340 \mathrm{~m} / \mathrm{s}$ )

173017 A whistle with frequency $1020 \mathrm{~Hz}$ is blown at a station. A man travelling in a train moving towards the station at $30 \mathrm{~m} / \mathrm{s}$ hears the sound of the whistle. If the speed of sound is $340 \mathrm{~m} / \mathrm{s}$, the apparent frequency heard by him is

173019 A car sounding its horn at $480 \mathrm{~Hz}$ moves towards a high wall at a speed of $20 \mathrm{~ms}^{-1}$. If the speed of sound is $340 \mathrm{~ms}^{-1}$, the frequency of the reflected sound heard by the girl sitting in the car will be closest to

173013 A train is moving at $30 \mathrm{~ms}^{-1}$ in still air. The frequency of the locomotive whistle is $500 \mathrm{~Hz}$ and the speed of sound is $345 \mathrm{~ms}^{-1}$. The apparent wavelength of sound in front of and behind the locomotive are respectively

173014 The apparent frequency of the whistle of an engine changes in the ratio $9: 8$ as the engine passes a stationary observer. If the velocity of the sound is $340 \mathrm{~ms}^{-1}$, then the velocity of the engine is :

173016 A source of sound of frequency $640 \mathrm{~Hz}$ is moving at a velocity of $\frac{100}{3} \mathrm{~m} / \mathrm{s}$ along a road, and is at an instant $30 \mathrm{~m}$ away from a point. A on the road (as shown in figure). A person standing at $\mathrm{O}, 40 \mathrm{~m}$ away from the road hears sound of apparent frequency $v^{\prime}$. The value of $v^{\prime}$ is (velocity of sound $=340 \mathrm{~m} / \mathrm{s}$ )

173017 A whistle with frequency $1020 \mathrm{~Hz}$ is blown at a station. A man travelling in a train moving towards the station at $30 \mathrm{~m} / \mathrm{s}$ hears the sound of the whistle. If the speed of sound is $340 \mathrm{~m} / \mathrm{s}$, the apparent frequency heard by him is

173019 A car sounding its horn at $480 \mathrm{~Hz}$ moves towards a high wall at a speed of $20 \mathrm{~ms}^{-1}$. If the speed of sound is $340 \mathrm{~ms}^{-1}$, the frequency of the reflected sound heard by the girl sitting in the car will be closest to