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A tuning fork of known frequency $256\,Hz$ makes $5$ beats per second with the vibrating string of a guitar. The beat frequency decreases to $2$ beats per second when the tension in the guitar string slightly increased. The frequency of the guitar string before increasing the tension was ..... $Hz$
A sound source of frequency $170 Hz$ is placed near a wall. A man walking from a source towards the wall finds that there is a periodic rise and fall of sound intensity. If the speed of sound in air is $340\, m/s$ the distance (in metres) separating the two adjacent positions of minimum intensity is
A steel wire has a length of $12.0 \;m$ and a mass of $2.10 \;kg .$ What should be the tension in the wire so that speed of a transverse wave on the wire equals the speed of sound in dry air at $20\,^{\circ} C =343\; m s ^{-1}$
What is minimum length of a tube, open at both ends, that resonates with tuning fork of frequency $350 Hz$ ? [velocity of sound in air $= 350 m/s$] ..... $cm$
A person observes two moving trains, '$A$' reaching the station and '$B$' leaving the station with equal speed of $30\,m / s$. If both trains emit sounds with frequency $300\,Hz$, (Speed of sound : $330\,m / s$ ) approximate difference of frequencies heard by the person will be $..........Hz$
A man stands in front of a hillock and fires a gun. He hears an echo after $1.5\, sec$. The distance of the hillock from the man is ...... $m$ (velocity of sound in air is $330\, m/s$)
A wave is represented by the equation $y = 7\sin \{ \pi (2t - 2x)\} $ where $x$ is in metres and $t$ in seconds. The velocity of the wave is ..... $m/s$
The speed of sound in hydrogen at $NTP$ is $1270\,m/s$ . Then, the speed in a mixture of hydrogen and oxygen in the ratio $4 : 1$ by volume will be ..... $m/s$