354702 A bat moving at \(10\;m{s^{ - 1}}\) towards a wall sends a sound signal of \(8000\;Hz\) towards it. On refelection it hears a sound of frequency \(f\). The value of \(f\) in \(Hz\) is close to (speed of sound \( = 320\;m{s^{ - 1}}\))

354703 A boy is walking away from a wall at a speed of \(1.0\;m/s\) as shown in the figure. The boy blows a whistle steadily. An observer towards whom the boy is moving hears 4 beats. If the speed of sound is \(340\;m/s\), the frequency of whistle is:

354704 A person with vibrating tuning fork of frequency \(338\;Hz\) is moving towards a vertical wall with a speed of \(2\;m{s^{ - 1}}\). Velocity of sound in air is 340 \(m{s^{ - 1}}\). The number of beats heard by that person per second is

354705
A source s emitting sound of \(400Hz\) is fixed on block \(A\) which is attached to free end of a spring \({S_A}\). The detector \(D\) fixed on block \(B\) attached to the free end of spring \({S_B}\) detects this sound. The blocks \(A\) and \(B\) are simultaneously displaced towards each other through a distance of \(1.0\,m\) and then left to vibrate. If vibrational frequency of each block is \(3Hz\), the maximum frequencies of sound detected by \(D\) is
\(({V_{{\rm{sound}}}} = 340\,m{\rm{/}}s)\)

354702 A bat moving at \(10\;m{s^{ - 1}}\) towards a wall sends a sound signal of \(8000\;Hz\) towards it. On refelection it hears a sound of frequency \(f\). The value of \(f\) in \(Hz\) is close to (speed of sound \( = 320\;m{s^{ - 1}}\))

354703 A boy is walking away from a wall at a speed of \(1.0\;m/s\) as shown in the figure. The boy blows a whistle steadily. An observer towards whom the boy is moving hears 4 beats. If the speed of sound is \(340\;m/s\), the frequency of whistle is:

354704 A person with vibrating tuning fork of frequency \(338\;Hz\) is moving towards a vertical wall with a speed of \(2\;m{s^{ - 1}}\). Velocity of sound in air is 340 \(m{s^{ - 1}}\). The number of beats heard by that person per second is

354705
A source s emitting sound of \(400Hz\) is fixed on block \(A\) which is attached to free end of a spring \({S_A}\). The detector \(D\) fixed on block \(B\) attached to the free end of spring \({S_B}\) detects this sound. The blocks \(A\) and \(B\) are simultaneously displaced towards each other through a distance of \(1.0\,m\) and then left to vibrate. If vibrational frequency of each block is \(3Hz\), the maximum frequencies of sound detected by \(D\) is
\(({V_{{\rm{sound}}}} = 340\,m{\rm{/}}s)\)

354702 A bat moving at \(10\;m{s^{ - 1}}\) towards a wall sends a sound signal of \(8000\;Hz\) towards it. On refelection it hears a sound of frequency \(f\). The value of \(f\) in \(Hz\) is close to (speed of sound \( = 320\;m{s^{ - 1}}\))

354703 A boy is walking away from a wall at a speed of \(1.0\;m/s\) as shown in the figure. The boy blows a whistle steadily. An observer towards whom the boy is moving hears 4 beats. If the speed of sound is \(340\;m/s\), the frequency of whistle is:

354704 A person with vibrating tuning fork of frequency \(338\;Hz\) is moving towards a vertical wall with a speed of \(2\;m{s^{ - 1}}\). Velocity of sound in air is 340 \(m{s^{ - 1}}\). The number of beats heard by that person per second is

354705
A source s emitting sound of \(400Hz\) is fixed on block \(A\) which is attached to free end of a spring \({S_A}\). The detector \(D\) fixed on block \(B\) attached to the free end of spring \({S_B}\) detects this sound. The blocks \(A\) and \(B\) are simultaneously displaced towards each other through a distance of \(1.0\,m\) and then left to vibrate. If vibrational frequency of each block is \(3Hz\), the maximum frequencies of sound detected by \(D\) is
\(({V_{{\rm{sound}}}} = 340\,m{\rm{/}}s)\)

354702 A bat moving at \(10\;m{s^{ - 1}}\) towards a wall sends a sound signal of \(8000\;Hz\) towards it. On refelection it hears a sound of frequency \(f\). The value of \(f\) in \(Hz\) is close to (speed of sound \( = 320\;m{s^{ - 1}}\))

354703 A boy is walking away from a wall at a speed of \(1.0\;m/s\) as shown in the figure. The boy blows a whistle steadily. An observer towards whom the boy is moving hears 4 beats. If the speed of sound is \(340\;m/s\), the frequency of whistle is:

354704 A person with vibrating tuning fork of frequency \(338\;Hz\) is moving towards a vertical wall with a speed of \(2\;m{s^{ - 1}}\). Velocity of sound in air is 340 \(m{s^{ - 1}}\). The number of beats heard by that person per second is

354705
A source s emitting sound of \(400Hz\) is fixed on block \(A\) which is attached to free end of a spring \({S_A}\). The detector \(D\) fixed on block \(B\) attached to the free end of spring \({S_B}\) detects this sound. The blocks \(A\) and \(B\) are simultaneously displaced towards each other through a distance of \(1.0\,m\) and then left to vibrate. If vibrational frequency of each block is \(3Hz\), the maximum frequencies of sound detected by \(D\) is
\(({V_{{\rm{sound}}}} = 340\,m{\rm{/}}s)\)