JEE Main · 2007 · 29 Apr 2007 · Offline · Waves & Sound

Two loudspeakers ( $L_1$ and $L_2$ ) are placed with a separation of 10 m , as shown in figure. Both speakers are fed with an audio input signal of same frequency with constant volume. A voice recorder, initially at point $A$, at equidistance to both loud speakers, is m …

In an open organ pipe $v_3$ and $v_6$ are $3^{\text{rd}}$ and $6^{\text{th}}$ harmonic frequencies, respectively. If $v_6-v_3=2200$ Hz then length of the pipe is $\_\_\_\_$ mm. (Take velocity of sound in air is $330$ m/s.)

The velocity of sound in air is doubled when the temperature is raised from $0^{\circ }\mathrm{C}$ to ${\alpha }^{\circ }\mathrm{C}$. The value of $\alpha$ is ______.

The fifth harmonic of a closed organ pipe is found to be in unison with the first harmonic of an open pipe. The ratio of lengths of closed pipe to that of the open pipe is 5/x. The value of x is ____.

A point source is kept at the center of a spherically enclosed detector. If the volume of the detector increased by 8 times, the intensity will

The speed of a longitudinal wave in a metallic bar is $400\mathrm{m}/\mathrm{s}$. If the density and Young's modulus of the bar material are increased by $0.5\%$ and $1\%$ respectively then the speed of the wave is changed approximately to ______ …