The sound waves produced in a medium are the longitudinal waves. Sound waves in air and fluids are longitudinal waves, because the particles that transport the sound vibrate parallel to the direction of the sound wave's travel.
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A point source emits sound equally in all directions in a non-absorbing medium, Two points $P$ and $Q $ are at distance of $2m$ and $3m$ respectively from the source. The ratio of the intensities of the waves at $P$ and $ Q$ is
A string is clamed at both the ends and it is vibrating in its $4^{th}$ harmonic. The equation of the stationary wave is $Y =0.3\,sin\,(0.157\,x) \,cos\,(200\pi t)$. The length of the string is ..... $m$ (all quantities are in $SI$ units)
A whistle of frequency $500 Hz$ tied to the end of a string of length $1.2 m$ revolves at $400 \,rev/min$. A listener standing some distance away in the plane of rotation of whistle hears frequencies in the range (speed of sound $= 340 m/s$)
A man is watching two trains, one leaving and the other coming in with equal speeds of $4\, m/sec$. If they sound their whistles, each of frequency $240 Hz$, the number of beats heard by the man (velocity of sound in air $= 320 m/sec$) will be equal to
An 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:
A certain string will resonant to several frequencies, the lowest of which is $200 \,cps$. What are the next three higher frequencies to which it resonants?
Two superimposing waves are represented by equation $y_1=2 \sin 2 \pi(10 t-0.4 x)$ and $y_2=4 \sin 2 \pi(20 t-0.8 x)$. The ratio of $I_{\max }$ to $I_{\min }$ is ........