A uniform string suspended vertically. A transverse pulse is created at the top most of the string. Then
speed of pulse remains constant
the speed of the pulse decreases with constant rate as pulse moves downward.
the speed of the pulse decreases with increasing rate as pulse moves downward
the speed of the pulse increases with constant rate as pulse moves downward
A train whistling at constant frequency is moving towards a station at a constant speed $V$. The train goes past a stationary observer on the station. The frequency $n'$ of the sound as heard by the observer is plotted as a function of time $t (Fig.)$ . Identify the expected curve
A pulse shown here is reflected from the rigid wall $A$ and then from free end $B.$ The shape of the string after these $2$ reflection will be
A sound absorber attenuates the sound level by $20\, dB$. The intensity decreases by a factor of
The amplitude of a wave represented by displacement equation $y = \frac{1}{{\sqrt a }}\,\sin \,\omega t \pm \frac{1}{{\sqrt b }}\,\cos \,\omega t$ will be
A person speaking normally produces a sound intensity of $40\, dB$ at a distance of $1\, m$. If the threshold intensity for reasonable audibility is $20\,dB$, the maximum distance at which he can be heard clearly is ..... $m$