Waves Test - 81...

A wave of frequency 400 Hz has a velocity of 320 $$ms^{-1}$$. The distance between the particles differing in phase by $$90^o$$ is

Which of the following equations does not represent a progressive wave ?

The spherical waves are emitted in a medium by a source of 5 watt. Assuming that medium does not absorbed energy,the intensity of wave at a distance of 5m from source will be

Sinusoidal wave having frequency $$500Hz$$ and speed $$800m/s$$.If two point in the medium are separated by distance z having phase difference $$\frac{\pi }{6},$$ then x is 

Consider a wave with frequency  $$300\mathrm { Hz }$$  and speed  $$350\mathrm { ms } ^ { - 1 } .$$  How far apart are two points  $$60 ^ { \circ }$$  out of phase?

The energy in the superposition of waves:

The displacement $$y$$ of a particle, if given by $$y=4\cos^2\left(\dfrac{t}{2}\right)\sin(1000t)$$. This expression may be considered to be a result of the superposition of how many simple harmonic motions?

A traveling wave is represented by the equation $$ y = \frac{1}{10} sin(60 t + 2x) $$, where x and y in meters and t is in second . this represents a wave
(1) of frequency $$ \frac {30}{\pi} Hz $$
(2) of wavelength $$ \pi m $$
(3)of amplitude 10 cm
(4) moving in the positive x direction
pick out the correct statements from the above.

String $$I$$ and $$II$$ identical lengths and linear mass densities but string $$I$$ is under greater tension than string $$II$$. The accompanying figure shows four different situation, $$A$$ to $$D$$ in which standing wave patterns exists on the two strings. In which situation is it possible that strings $$I$$ and $$II$$ are oscillating at the same resonant frequency?