A siren emitting sound of frequency $500 \;Hz$ is going away from a static listener with a speed of $50\, m/sec$. The frequency of sound to be heard, directly from the siren, is .... $Hz$
AIIMS 1999, Medium
Download our appand get started for free
Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*
Similar Questions
- 1A hearing test is conducted on an aged person. It is found that her thresold of hearing is $20 \,dB$ at $1 \,kHz$ and it rises linearly with frequency to $60 \,dB$ at $9 \,kHz$. The minimum intensity of sound that the person can hear at $5 \,kHz$ isView Solution
- 2A source and an observer move away from each other with a velocity of $10\; m/s$ with respect to ground. If the observer finds the frequency of sound coming from the source as $1950 \;Hz$, then actual frequency of the source is .... $Hz$ (velocity of sound in air = $340\; m/s$)View Solution
- 3Assume that the displacement$(s)$ of air is proportional to the pressure difference $(\Delta p)$ created by a sound wave. Displacement$(s)$ further depends on the speed of sound $(v),$ density of air $(\rho)$ and the frequency $(f)$ If $\Delta p \approx 10\, Pa , v \approx 300\, m / s , p \approx 1\, kg / m ^{3}$ and $f \approx 1000 \,Hz$, then $s$ will be the order ofView Solution
(take multiplicative constant to be $1$ )
- 4View SolutionWhen a tuning fork vibrates, the waves produced in the fork are
- 5View SolutionAs a wave propagates
- 6Two waves of wavelengths $99\, cm$ and $100\, cm$ both travelling with velocity $396\, m/s$ are made to interfere. The number of beats produced by them per second isView Solution
- 7A string is stretched between fixed points separated by $75.0\, cm$. It is observed to have resonant frequencies of $420\, Hz$ and $315\, Hz$. There are no other resonant frequencies between these two. Then, the lowest resonant frequency for this string is .... $Hz$View Solution
- 8If two waves having amplitudes $2A$ and $A$ and same frequency and velocity, propagate in the same direction in the same phase, the resulting amplitude will beView Solution
- 9In the resonance tube experiment, first resonant length is $l_1$ and second resonant length is $l_2$ then the third resonant length will beView Solution
- 10A string fixed at both ends vibrates in three loops. The wave length is $10\, cm$ . The length of string is .... $cm$View Solution