172983 A source producing sound of frequency $170 \mathrm{~Hz}$ is approaching a stationary observer with a velocity $17 \mathrm{~ms}^{-1}$.
The apparent change in the wavelength of sound heard by the observer is (speed of sound in air $=340 \mathrm{~ms}^{-1}$ ).

172984 A source of sound whose frequency is $1000 \mathrm{~Hz}$ is moving with a speed $33 \mathrm{~m} / \mathrm{s}$. The waves reflected by a fixed obstacle are registered by a receiver that moves together with the source. The speed of the sound waves is $330 \mathrm{~m} / \mathrm{s}$, then the frequency registered by the receiver is

172990 The depth of the sea measured by means of an echo. If the time between the moment of the sound produced and received is $3.52 \mathrm{~s}$, then the depth of the sea is
(The compressibility of sea water is $4.84 \times 10^{-10}$ $\mathrm{m}^{2} \mathrm{~N}^{-1}$ and its density is $1024 \mathrm{~kg} \mathrm{~m}^{-3}$ ) is

172985 A source $S$ emitting sound of frequency $288 \mathrm{~Hz}$ is fixed on block $B$ which is attached to the free end of a spring $S_{2}$ and an observer $O$ is on block $A$ which is attached to the free end of spring $S_{1}$ as shown in the figure. The blocks $A$ and $B$ are simultaneously displaced towards each other through a distance of $0.5 \mathrm{~m}$ and then left to oscillate. If the angular velocity of each blocks is $40 \mathrm{rad} \mathrm{s}^{-1}$, then the maximum frequency observed by the observer is (speed of sound in air is $340 \mathrm{~ms}^{-1}$ )

172983 A source producing sound of frequency $170 \mathrm{~Hz}$ is approaching a stationary observer with a velocity $17 \mathrm{~ms}^{-1}$.
The apparent change in the wavelength of sound heard by the observer is (speed of sound in air $=340 \mathrm{~ms}^{-1}$ ).

172984 A source of sound whose frequency is $1000 \mathrm{~Hz}$ is moving with a speed $33 \mathrm{~m} / \mathrm{s}$. The waves reflected by a fixed obstacle are registered by a receiver that moves together with the source. The speed of the sound waves is $330 \mathrm{~m} / \mathrm{s}$, then the frequency registered by the receiver is

172990 The depth of the sea measured by means of an echo. If the time between the moment of the sound produced and received is $3.52 \mathrm{~s}$, then the depth of the sea is
(The compressibility of sea water is $4.84 \times 10^{-10}$ $\mathrm{m}^{2} \mathrm{~N}^{-1}$ and its density is $1024 \mathrm{~kg} \mathrm{~m}^{-3}$ ) is

172985 A source $S$ emitting sound of frequency $288 \mathrm{~Hz}$ is fixed on block $B$ which is attached to the free end of a spring $S_{2}$ and an observer $O$ is on block $A$ which is attached to the free end of spring $S_{1}$ as shown in the figure. The blocks $A$ and $B$ are simultaneously displaced towards each other through a distance of $0.5 \mathrm{~m}$ and then left to oscillate. If the angular velocity of each blocks is $40 \mathrm{rad} \mathrm{s}^{-1}$, then the maximum frequency observed by the observer is (speed of sound in air is $340 \mathrm{~ms}^{-1}$ )

172983 A source producing sound of frequency $170 \mathrm{~Hz}$ is approaching a stationary observer with a velocity $17 \mathrm{~ms}^{-1}$.
The apparent change in the wavelength of sound heard by the observer is (speed of sound in air $=340 \mathrm{~ms}^{-1}$ ).

172984 A source of sound whose frequency is $1000 \mathrm{~Hz}$ is moving with a speed $33 \mathrm{~m} / \mathrm{s}$. The waves reflected by a fixed obstacle are registered by a receiver that moves together with the source. The speed of the sound waves is $330 \mathrm{~m} / \mathrm{s}$, then the frequency registered by the receiver is

172990 The depth of the sea measured by means of an echo. If the time between the moment of the sound produced and received is $3.52 \mathrm{~s}$, then the depth of the sea is
(The compressibility of sea water is $4.84 \times 10^{-10}$ $\mathrm{m}^{2} \mathrm{~N}^{-1}$ and its density is $1024 \mathrm{~kg} \mathrm{~m}^{-3}$ ) is

172985 A source $S$ emitting sound of frequency $288 \mathrm{~Hz}$ is fixed on block $B$ which is attached to the free end of a spring $S_{2}$ and an observer $O$ is on block $A$ which is attached to the free end of spring $S_{1}$ as shown in the figure. The blocks $A$ and $B$ are simultaneously displaced towards each other through a distance of $0.5 \mathrm{~m}$ and then left to oscillate. If the angular velocity of each blocks is $40 \mathrm{rad} \mathrm{s}^{-1}$, then the maximum frequency observed by the observer is (speed of sound in air is $340 \mathrm{~ms}^{-1}$ )

172983 A source producing sound of frequency $170 \mathrm{~Hz}$ is approaching a stationary observer with a velocity $17 \mathrm{~ms}^{-1}$.
The apparent change in the wavelength of sound heard by the observer is (speed of sound in air $=340 \mathrm{~ms}^{-1}$ ).

172984 A source of sound whose frequency is $1000 \mathrm{~Hz}$ is moving with a speed $33 \mathrm{~m} / \mathrm{s}$. The waves reflected by a fixed obstacle are registered by a receiver that moves together with the source. The speed of the sound waves is $330 \mathrm{~m} / \mathrm{s}$, then the frequency registered by the receiver is

172990 The depth of the sea measured by means of an echo. If the time between the moment of the sound produced and received is $3.52 \mathrm{~s}$, then the depth of the sea is
(The compressibility of sea water is $4.84 \times 10^{-10}$ $\mathrm{m}^{2} \mathrm{~N}^{-1}$ and its density is $1024 \mathrm{~kg} \mathrm{~m}^{-3}$ ) is

172985 A source $S$ emitting sound of frequency $288 \mathrm{~Hz}$ is fixed on block $B$ which is attached to the free end of a spring $S_{2}$ and an observer $O$ is on block $A$ which is attached to the free end of spring $S_{1}$ as shown in the figure. The blocks $A$ and $B$ are simultaneously displaced towards each other through a distance of $0.5 \mathrm{~m}$ and then left to oscillate. If the angular velocity of each blocks is $40 \mathrm{rad} \mathrm{s}^{-1}$, then the maximum frequency observed by the observer is (speed of sound in air is $340 \mathrm{~ms}^{-1}$ )