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The distance between two consecutive points with phase difference of $60^{\circ}$ in a wave of frequency $500\,Hz$ is $6.0\,m$. The velocity with which wave is traveling is $.........km / s$
A 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 $5 \,kHz$ is
It takes $2.0$ seconds for a sound wave to travel between two fixed points when the day temperature is ${10^o}C.$ If the temperature rise to ${30^o}C$ the sound wave travels between the same fixed parts in ...... $sec$
The equation of the progressive wave, where $t$ is the time in second, $x$ is the distance in metre is $y=A \cos 240\left(t-\frac{x}{12}\right)$. The phase difference (in $SI$ units) between two positions $0.5 \,m$ apart is ...........
Three musicians experiment with the Doppler effect. Musician $A$ rides in a car at a speed $u$ directly away from musician $B$ who is stationary. Musician $C$ rides in a car directly toward $B$ and travels at the same speed as $A$ . Musician $A$ plays a note at frequency $f_A$ on his trumpet $B$ hears the note, adjusts his trumpet, and plays the same note he heard. Choose the incorrect statement
A sinusoidal wave of frequency $500 \,Hz$ has a speed of $350 \,m / s$. The phase difference between two displacements at a certain point at times $1 \,m$ apart is ...........
In an experiment to study standing waves, you use a string whose mass per length is $μ$ = $(1.0 ± 0.1) × 10^{-4}\ kg/m$ . You look at the fundamental mode, whose frequency $f$ is related to the length $L$ and tension $T$ of the string by the following equation $L$ = $\frac{1}{{2f}}\sqrt {\frac{T}{\mu }} $ You make a plot with $L$ on the $y-$ axis and $\sqrt T$ on the $x-$ axis, and find that the best fitting line is $y$ = $(8.0 ± 0.3) × 10^{-3}x + (0.2 ± 0.04)$ in $SI\ units$ . What is the value of the frequency of the wave (including the error)? Express your result in $SI\ unit\ (Hz)$