Question

6. A group of soldiers marching in unison are asked to break their stride when entering
Why?
(a) To change the coherence of their footsteps.
(b) To reduce the resonance from their footsteps.
(c) To reduce the repeated echo from their footsteps.
(d) To reduce the collective amplitude of their footsteps.​

Answer 1

it is b. beacause are they March, they cause the bridge to vibrate along with them.

Pls mark brainliest.

Answer 2

A 'group of soldiers' marching in unison' are asked to 'break their stride' when entering to 'reduce the 'resonance' from their footsteps'.

Answer: Option (b)

Explanation:

When marching, soldiers press the legs together, which results in producing a sound or forced vibrations of the large frequency. It may happen that the force vibrations of the large frequency which is made by them may match with the 'natural frequency' of the floor on which they are marching. It happens due to the phenomenon of the Resonance. So, they are asked to break their stride to reduce the resonance.