Which of the following is NOT the characteristic of the progressive wave?

The equation $y=a\sin \frac{2\pi }{\lambda }(vt-x)$ is the equation of

Dimensions of wavelength of progressive wave is

A pulse on the string is inverted, when it is reflected from

The transverse waves can propagate through

The production of echo is due to

A wave shown by the equation, $y=A\cos (\omega t-\varphi )$ is totally reflected by a closed end. After reflection,