173082 A man is standing between two parallel cliffs and fires a gun. If he hears first and second echoes after $1.5 \mathrm{~s}$ and $3.5 \mathrm{~s}$ respectively the distance between the cliffs is: (Velocity of sound in air $=340 \mathrm{~ms}^{-1}$ )

173083 A siren emitting a sound of frequency $800 \mathrm{~Hz}$ moves away from an observer towards a cliff at a speed of $15 \mathrm{~ms}^{-1}$. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take, velocity of sound in air $=330 \mathrm{~ms}^{-1}$ )

173084 A source of sound $S$ emitting waves of frequency $100 \mathrm{~Hz}$ and an observer $\mathrm{O}$ are located at some distance from each other. The source is moving with a speed of $19.4 \mathrm{~ms}^{-1}$ at an angle of $60^{\circ}$ with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air is $330 \mathrm{~ms}^{-1}$ ), is

173085 A speeding motorcyclist sees traffic jam ahead of him. He slows down to $36 \mathrm{~km} / \mathrm{h}$. He finds that traffic has eased and a car moving ahead of him at $18 \mathrm{~km} / \mathrm{h}$ is knocking at a frequency of $1392 \mathrm{~Hz}$. If the speed of sound is $343 \mathrm{~m} / \mathrm{s}$, the frequency of the honk as heard by him will be

173082 A man is standing between two parallel cliffs and fires a gun. If he hears first and second echoes after $1.5 \mathrm{~s}$ and $3.5 \mathrm{~s}$ respectively the distance between the cliffs is: (Velocity of sound in air $=340 \mathrm{~ms}^{-1}$ )

173083 A siren emitting a sound of frequency $800 \mathrm{~Hz}$ moves away from an observer towards a cliff at a speed of $15 \mathrm{~ms}^{-1}$. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take, velocity of sound in air $=330 \mathrm{~ms}^{-1}$ )

173084 A source of sound $S$ emitting waves of frequency $100 \mathrm{~Hz}$ and an observer $\mathrm{O}$ are located at some distance from each other. The source is moving with a speed of $19.4 \mathrm{~ms}^{-1}$ at an angle of $60^{\circ}$ with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air is $330 \mathrm{~ms}^{-1}$ ), is

173085 A speeding motorcyclist sees traffic jam ahead of him. He slows down to $36 \mathrm{~km} / \mathrm{h}$. He finds that traffic has eased and a car moving ahead of him at $18 \mathrm{~km} / \mathrm{h}$ is knocking at a frequency of $1392 \mathrm{~Hz}$. If the speed of sound is $343 \mathrm{~m} / \mathrm{s}$, the frequency of the honk as heard by him will be

173082 A man is standing between two parallel cliffs and fires a gun. If he hears first and second echoes after $1.5 \mathrm{~s}$ and $3.5 \mathrm{~s}$ respectively the distance between the cliffs is: (Velocity of sound in air $=340 \mathrm{~ms}^{-1}$ )

173083 A siren emitting a sound of frequency $800 \mathrm{~Hz}$ moves away from an observer towards a cliff at a speed of $15 \mathrm{~ms}^{-1}$. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take, velocity of sound in air $=330 \mathrm{~ms}^{-1}$ )

173084 A source of sound $S$ emitting waves of frequency $100 \mathrm{~Hz}$ and an observer $\mathrm{O}$ are located at some distance from each other. The source is moving with a speed of $19.4 \mathrm{~ms}^{-1}$ at an angle of $60^{\circ}$ with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air is $330 \mathrm{~ms}^{-1}$ ), is

173085 A speeding motorcyclist sees traffic jam ahead of him. He slows down to $36 \mathrm{~km} / \mathrm{h}$. He finds that traffic has eased and a car moving ahead of him at $18 \mathrm{~km} / \mathrm{h}$ is knocking at a frequency of $1392 \mathrm{~Hz}$. If the speed of sound is $343 \mathrm{~m} / \mathrm{s}$, the frequency of the honk as heard by him will be

173082 A man is standing between two parallel cliffs and fires a gun. If he hears first and second echoes after $1.5 \mathrm{~s}$ and $3.5 \mathrm{~s}$ respectively the distance between the cliffs is: (Velocity of sound in air $=340 \mathrm{~ms}^{-1}$ )

173083 A siren emitting a sound of frequency $800 \mathrm{~Hz}$ moves away from an observer towards a cliff at a speed of $15 \mathrm{~ms}^{-1}$. Then, the frequency of sound that the observer hears in the echo reflected from the cliff is (Take, velocity of sound in air $=330 \mathrm{~ms}^{-1}$ )

173084 A source of sound $S$ emitting waves of frequency $100 \mathrm{~Hz}$ and an observer $\mathrm{O}$ are located at some distance from each other. The source is moving with a speed of $19.4 \mathrm{~ms}^{-1}$ at an angle of $60^{\circ}$ with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air is $330 \mathrm{~ms}^{-1}$ ), is

173085 A speeding motorcyclist sees traffic jam ahead of him. He slows down to $36 \mathrm{~km} / \mathrm{h}$. He finds that traffic has eased and a car moving ahead of him at $18 \mathrm{~km} / \mathrm{h}$ is knocking at a frequency of $1392 \mathrm{~Hz}$. If the speed of sound is $343 \mathrm{~m} / \mathrm{s}$, the frequency of the honk as heard by him will be