Question

1: Primary waves can travel in all directions in an ether
2: Secondary waves can travel only in backward in an ether

• A. 1 is true, 2 is false
• B. Both 1 and 2 are true
• C. 1 is false, 2 is true
• D. Both 1 and 2 are false

Answer 1

The correct option is A 1 is true, 2 is false

Primary wave can travel in all directions in ether.
Secondary waves can travel in forward direction in ether

The wavefronts gradually spread in all the directions. So at every point, we have a wave coming out. The primary wavefront is formed and again from the primary wavefront, a secondary waveform is formed and so on. The disturbance does not last for a long time.