173035 If a source approaches and recedes from observer with same velocity, the ratio of frequencies (apparent) is $6: 5$, then velocity of source is : $\left(\mathrm{v}_{\mathrm{s}}=330 \mathrm{~m} / \mathrm{s}\right)$

173036 A source and an observer move away from each other, with a velocity of $20 \mathrm{~m} / \mathrm{s}$. If the apparent frequency heard by the observer is $1840 \mathrm{~Hz}$, the actual frequency of the source is : (Velocity of sound in air $=\mathbf{3 4 0} \mathrm{m} / \mathrm{s}$ ):

173037 Two car $A$ and $B$ approach a stationary observer from opposite sides as shown in fig. Observer hears no beats. If the frequency of the horn of the car B is $504 \mathrm{~Hz}$, the frequency of horn of car A will be.


$\mathrm{B}$

173038 A whistle giving out $450 \mathrm{~Hz}$ approaches a stationary observes at a speed of $33 \mathrm{~m} / \mathrm{s}$. The frequency heard by the observer (in $\mathrm{Hz}$ ) is (speed of sound $=330 \mathrm{~m} / \mathrm{s}$ ).

173039 A police car moving at $30 \mathrm{~m} / \mathrm{s}$, chases a motorcyclist. The police man sounds his horn at $180 \mathrm{~Hz}$, while both of them move towards a stationary siren of frequency $160 \mathrm{~Hz}$. Calculate the speed of the motorcyclist, if it is given that he does not observes any beats (take, speed of sound $=330 \mathrm{~m} / \mathrm{s}$ ).

173035 If a source approaches and recedes from observer with same velocity, the ratio of frequencies (apparent) is $6: 5$, then velocity of source is : $\left(\mathrm{v}_{\mathrm{s}}=330 \mathrm{~m} / \mathrm{s}\right)$

173036 A source and an observer move away from each other, with a velocity of $20 \mathrm{~m} / \mathrm{s}$. If the apparent frequency heard by the observer is $1840 \mathrm{~Hz}$, the actual frequency of the source is : (Velocity of sound in air $=\mathbf{3 4 0} \mathrm{m} / \mathrm{s}$ ):

173037 Two car $A$ and $B$ approach a stationary observer from opposite sides as shown in fig. Observer hears no beats. If the frequency of the horn of the car B is $504 \mathrm{~Hz}$, the frequency of horn of car A will be.


$\mathrm{B}$

173038 A whistle giving out $450 \mathrm{~Hz}$ approaches a stationary observes at a speed of $33 \mathrm{~m} / \mathrm{s}$. The frequency heard by the observer (in $\mathrm{Hz}$ ) is (speed of sound $=330 \mathrm{~m} / \mathrm{s}$ ).

173039 A police car moving at $30 \mathrm{~m} / \mathrm{s}$, chases a motorcyclist. The police man sounds his horn at $180 \mathrm{~Hz}$, while both of them move towards a stationary siren of frequency $160 \mathrm{~Hz}$. Calculate the speed of the motorcyclist, if it is given that he does not observes any beats (take, speed of sound $=330 \mathrm{~m} / \mathrm{s}$ ).

173035 If a source approaches and recedes from observer with same velocity, the ratio of frequencies (apparent) is $6: 5$, then velocity of source is : $\left(\mathrm{v}_{\mathrm{s}}=330 \mathrm{~m} / \mathrm{s}\right)$

173036 A source and an observer move away from each other, with a velocity of $20 \mathrm{~m} / \mathrm{s}$. If the apparent frequency heard by the observer is $1840 \mathrm{~Hz}$, the actual frequency of the source is : (Velocity of sound in air $=\mathbf{3 4 0} \mathrm{m} / \mathrm{s}$ ):

173037 Two car $A$ and $B$ approach a stationary observer from opposite sides as shown in fig. Observer hears no beats. If the frequency of the horn of the car B is $504 \mathrm{~Hz}$, the frequency of horn of car A will be.


$\mathrm{B}$

173038 A whistle giving out $450 \mathrm{~Hz}$ approaches a stationary observes at a speed of $33 \mathrm{~m} / \mathrm{s}$. The frequency heard by the observer (in $\mathrm{Hz}$ ) is (speed of sound $=330 \mathrm{~m} / \mathrm{s}$ ).

173039 A police car moving at $30 \mathrm{~m} / \mathrm{s}$, chases a motorcyclist. The police man sounds his horn at $180 \mathrm{~Hz}$, while both of them move towards a stationary siren of frequency $160 \mathrm{~Hz}$. Calculate the speed of the motorcyclist, if it is given that he does not observes any beats (take, speed of sound $=330 \mathrm{~m} / \mathrm{s}$ ).

173035 If a source approaches and recedes from observer with same velocity, the ratio of frequencies (apparent) is $6: 5$, then velocity of source is : $\left(\mathrm{v}_{\mathrm{s}}=330 \mathrm{~m} / \mathrm{s}\right)$

173036 A source and an observer move away from each other, with a velocity of $20 \mathrm{~m} / \mathrm{s}$. If the apparent frequency heard by the observer is $1840 \mathrm{~Hz}$, the actual frequency of the source is : (Velocity of sound in air $=\mathbf{3 4 0} \mathrm{m} / \mathrm{s}$ ):

173037 Two car $A$ and $B$ approach a stationary observer from opposite sides as shown in fig. Observer hears no beats. If the frequency of the horn of the car B is $504 \mathrm{~Hz}$, the frequency of horn of car A will be.


$\mathrm{B}$

173038 A whistle giving out $450 \mathrm{~Hz}$ approaches a stationary observes at a speed of $33 \mathrm{~m} / \mathrm{s}$. The frequency heard by the observer (in $\mathrm{Hz}$ ) is (speed of sound $=330 \mathrm{~m} / \mathrm{s}$ ).

173039 A police car moving at $30 \mathrm{~m} / \mathrm{s}$, chases a motorcyclist. The police man sounds his horn at $180 \mathrm{~Hz}$, while both of them move towards a stationary siren of frequency $160 \mathrm{~Hz}$. Calculate the speed of the motorcyclist, if it is given that he does not observes any beats (take, speed of sound $=330 \mathrm{~m} / \mathrm{s}$ ).

173035 If a source approaches and recedes from observer with same velocity, the ratio of frequencies (apparent) is $6: 5$, then velocity of source is : $\left(\mathrm{v}_{\mathrm{s}}=330 \mathrm{~m} / \mathrm{s}\right)$

173036 A source and an observer move away from each other, with a velocity of $20 \mathrm{~m} / \mathrm{s}$. If the apparent frequency heard by the observer is $1840 \mathrm{~Hz}$, the actual frequency of the source is : (Velocity of sound in air $=\mathbf{3 4 0} \mathrm{m} / \mathrm{s}$ ):

173037 Two car $A$ and $B$ approach a stationary observer from opposite sides as shown in fig. Observer hears no beats. If the frequency of the horn of the car B is $504 \mathrm{~Hz}$, the frequency of horn of car A will be.


$\mathrm{B}$

173038 A whistle giving out $450 \mathrm{~Hz}$ approaches a stationary observes at a speed of $33 \mathrm{~m} / \mathrm{s}$. The frequency heard by the observer (in $\mathrm{Hz}$ ) is (speed of sound $=330 \mathrm{~m} / \mathrm{s}$ ).

173039 A police car moving at $30 \mathrm{~m} / \mathrm{s}$, chases a motorcyclist. The police man sounds his horn at $180 \mathrm{~Hz}$, while both of them move towards a stationary siren of frequency $160 \mathrm{~Hz}$. Calculate the speed of the motorcyclist, if it is given that he does not observes any beats (take, speed of sound $=330 \mathrm{~m} / \mathrm{s}$ ).