Q180 / 180 · KCET 2012 · Physics

Which of the following is incorrect?

A
'Diffraction' helps us to distinguish between sound wave and light wave
Correct answer
B
If the wave is longitudinal, it must be a mechanical wave
C
If the wave is mechanical, it may or may not be a transverse wave
D
Mechanical waves cannot propagate in vacuum

Hence, the correct answer is option: 'B'.

Relevant Questions

The angle between the particle velocity and wave velocity in a transverse wave is [except when the particle passes through the mean position2025Basics of Mechanical Waves
What is a period of revolution of earth satellite ? Ignore the height of satellite above the surface of earth. Given : (1) The value of grav2014Basics of Mechanical Waves
The equation of a transverse wave is given by , where are in metre and is in second. The minimum distance of separation between two particle2013Basics of Mechanical Waves
represents an equation of a progressive wave, where is in second and is in metre. The distance travelled by the wave in is2009Basics of Mechanical Waves
A string vibrates with a frequency of . When its length is doubled and tension is altered, it begins to vibrate with a frequency of . The ra2008Basics of Mechanical Waves
The maximum particle velocity in a wave motion is half the wave velocity. Then the amplitude of the wave is equal to2007Basics of Mechanical Waves