The minimum distance of reflector surface from the source for listening the echo of sound is ..... $m$
Medium
Download our app for free and get started
(d) $2d = v \times t$, where $v = $velocity of sound $= 332 \,m/s$
$t =$ Persistence of hearing = $\frac{1}{{10}}\sec $.
==> $d = \frac{{v \times t}}{2} = \frac{{332 \times \frac{1}{{10}}}}{2} = 16.5\,m$
$t =$ Persistence of hearing = $\frac{1}{{10}}\sec $.
==> $d = \frac{{v \times t}}{2} = \frac{{332 \times \frac{1}{{10}}}}{2} = 16.5\,m$
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
- 1An observer starts moving with uniform acceleration $'a'$ towards a stationary sound source of frequency $f.$ As the observer approaches the source, the apparent frequency $f'$ heard by the observer varies with time $t$ as:View Solution
- 2The length of two open organ pipes are $l$ and $(l + \Delta l)$ respectively. Neglecting end correction, the frequency of beats between them will be approximately (Here $v$ is the speed of sound)View Solution
- 3If the phase difference between the two wave is 2$\pi $ during superposition, then the resultant amplitude isView Solution
- 4A wave is propagating along $x$-axis. The displacement of particles of the medium in $z$-direction at $t = 0$ is given by: $z =$ exp$[ -(x + 2)^2]$ , where $‘x’$ is in meters. At $t = 1s$, the same wave disturbance is given by: $z =$ exp $ [ - (2 - x)^2 ]$. Then, the wave propagation velocity isView Solution
- 5Sound waves travel at $350\,\, m/s$ through a warm air and at $3500\,\, m/s$ through brass. The wavelength of a $700\,\, Hz$ acoustic wave as it enters brass from warm airView Solution
- 6A string of length $1\ m$ fixed at both ends is vibrating in $3^{rd}$ overtone. Tension in string is $200\ N$ and linear mass density is $5\ gm/m$ . Frequency of these vibrations is ..... $Hz$View Solution
- 7The fundamental frequency of a sonometer wire of length $l$ is $n_0$ . A bridge is now introduced at a distance of $\Delta l ( < < l)$ from the centre of the wire. The lengths of wire on the two sides of the bridge are now vibrated in their fundamental modes. Then, the beat frequency nearly isView Solution
- 8A sound source, emitting sound of constant frequency, moves with a constant speed and crosses a stationary observer. The frequency (n) of sound heard by the observer is plotted against time $( t )$. Which of the following graphs represents the correct variation?View Solution
- 9If separation between screen and source is increased by $2\%$ what would be the effect on the intensityView Solution
- 10View SolutionSound velocity is maximum in