Question

The speed of the lorry is 50 mph. What is the speed of the lorry in

Answer 1

The speed f the lorry in the vacuum will become zero.

Explanation:

• Sound needs a medium to travel.
• A sound can travel through gas, liquid and solid but it can not travel through a vacuum.
• A sound always needs a medium to travel and if there is no medium then we can not hear any sound.
• The composition of the medium plays a key role in the speed of sound.
• It is fastest in solids and slowest in gases.