172935 An object, moving in a straight line with velocity $100 \mathrm{~ms}^{-1}$, goes past a stationary observer. If the object emits note of $400 \mathrm{~Hz}$ while moving, the change in the frequency noted by the observer as the object goes past him is (speed of sound in air $=300 \mathrm{~ms}^{-1}$ )

172936 With what velocity an observer should move relative to a stationary source so that a sound of double the frequency of source is heard by an observer?

172937 When the observer moves towards a stationary source with velocity $V_{1}$, the apparent frequency of emitted note is $F_{1}$. When observer moves away from the source with velocity $V_{1}$, the apparent frequency is $F_{2}$. If $\mathrm{V}$ is the velocity of sound in air and $\frac{F_{1}}{F_{2}}=2$ then $\frac{V}{V_{1}}$ is equal to

172938 An observer is approaching a stationary source with a velocity $\left(\frac{1}{4}\right)^{\text {th }}$ of the velocity of sound.
Then, the ratio of the apparent frequency heard by the observer to the actual frequency of the source is

172935 An object, moving in a straight line with velocity $100 \mathrm{~ms}^{-1}$, goes past a stationary observer. If the object emits note of $400 \mathrm{~Hz}$ while moving, the change in the frequency noted by the observer as the object goes past him is (speed of sound in air $=300 \mathrm{~ms}^{-1}$ )

172936 With what velocity an observer should move relative to a stationary source so that a sound of double the frequency of source is heard by an observer?

172937 When the observer moves towards a stationary source with velocity $V_{1}$, the apparent frequency of emitted note is $F_{1}$. When observer moves away from the source with velocity $V_{1}$, the apparent frequency is $F_{2}$. If $\mathrm{V}$ is the velocity of sound in air and $\frac{F_{1}}{F_{2}}=2$ then $\frac{V}{V_{1}}$ is equal to

172938 An observer is approaching a stationary source with a velocity $\left(\frac{1}{4}\right)^{\text {th }}$ of the velocity of sound.
Then, the ratio of the apparent frequency heard by the observer to the actual frequency of the source is

172935 An object, moving in a straight line with velocity $100 \mathrm{~ms}^{-1}$, goes past a stationary observer. If the object emits note of $400 \mathrm{~Hz}$ while moving, the change in the frequency noted by the observer as the object goes past him is (speed of sound in air $=300 \mathrm{~ms}^{-1}$ )

172936 With what velocity an observer should move relative to a stationary source so that a sound of double the frequency of source is heard by an observer?

172937 When the observer moves towards a stationary source with velocity $V_{1}$, the apparent frequency of emitted note is $F_{1}$. When observer moves away from the source with velocity $V_{1}$, the apparent frequency is $F_{2}$. If $\mathrm{V}$ is the velocity of sound in air and $\frac{F_{1}}{F_{2}}=2$ then $\frac{V}{V_{1}}$ is equal to

172938 An observer is approaching a stationary source with a velocity $\left(\frac{1}{4}\right)^{\text {th }}$ of the velocity of sound.
Then, the ratio of the apparent frequency heard by the observer to the actual frequency of the source is

172935 An object, moving in a straight line with velocity $100 \mathrm{~ms}^{-1}$, goes past a stationary observer. If the object emits note of $400 \mathrm{~Hz}$ while moving, the change in the frequency noted by the observer as the object goes past him is (speed of sound in air $=300 \mathrm{~ms}^{-1}$ )

172936 With what velocity an observer should move relative to a stationary source so that a sound of double the frequency of source is heard by an observer?

172937 When the observer moves towards a stationary source with velocity $V_{1}$, the apparent frequency of emitted note is $F_{1}$. When observer moves away from the source with velocity $V_{1}$, the apparent frequency is $F_{2}$. If $\mathrm{V}$ is the velocity of sound in air and $\frac{F_{1}}{F_{2}}=2$ then $\frac{V}{V_{1}}$ is equal to

172938 An observer is approaching a stationary source with a velocity $\left(\frac{1}{4}\right)^{\text {th }}$ of the velocity of sound.
Then, the ratio of the apparent frequency heard by the observer to the actual frequency of the source is