The wave equations of two particles are given by \(y_1=a\sin(\omega t-kx), y_2 = a \sin(kx+\omega t),\) then:

1.	they are moving in the opposite direction.
2.	the phase between them is \(90^{\circ}\).
3.	the phase between them is \(45^{\circ}\).
4.	the phase between them is \(0^{\circ}\).

A transverse wave is represented by the equation $y=y_0\sin \frac{2\pi }{\lambda }(vt-x)$

For what value of λ, the maximum particle velocity equal to two times the wave velocity?

(1) $\lambda =2\pi y_0$

(2) $\lambda =\pi y_0/3$

(3) $\lambda =\pi y_0/2$

(4) $\lambda =\pi y_0$

A wave travels in a medium according to the equation of displacement given by $y(x,t)=0.03\sin \pi (2t-0.01x)$ where y and x are in metres and t in seconds. The wavelength of the wave is :

1. 200 m

2. 100 m

3. 20 m

4. 10 m

The frequency of the sinusoidal wave $y=0.40\cos [2000t+0.80x]$ would be :

(1) 1000 π Hz

(2) 2000 Hz

(3) 20 Hz

(4) $\frac{1000}{\pi }Hz$

The equation of a plane progressive wave is given by $y=0.025\sin (100t+0.25x)$. The frequency of this wave would be :

(1) $\frac{50}{\pi }Hz$

(2) $\frac{100}{\pi }Hz$

(3) 100 Hz

(4) 50 Hz

In the given progressive wave equation, what is the maximum velocity of particle $Y=0.5\sin (10\pi t-5x)$cm 

(1) 5 cm/s

(2) 5π cm/s

(3) 10 cm/s

(4) 10.5 cm/s

Two waves of frequencies 20 Hz and 30 Hz travel out from a common point. The phase difference between them after 0.6 sec is :

(1) Zero

(2) $\frac{\pi }{2}$

(3) π

(4) $\frac{3\pi }{4}$

A simple harmonic progressive wave is represented by the equation : $y=8\sin 2\pi (0.1x-2t)$ where x and y are in cm and t is in seconds. At any instant the phase difference between two particles separated by 2.0 cm in the x-direction is :

(1) 18°

(2) 36°

(3) 54°

(4) 72°

The equation of progressive wave is $y=a\sin (200t-x)$. where x is in meter and t is in second. The velocity of wave is :

(1) 200 m/sec

(2) 100 m/sec

(3) 50 m/sec

(4) None of these