Question

1 Why the sound waves are called
mechanicalwaves? ਧੁਨੀ ਤਰੰਗਾਂ ਨੂੰ ਯਾਂਤਰਿਕ
ਤਰੰਗਾਂ ਕਿਓ ਕਿਹਾ ਜਾਂਦਾ ਹੈ? 2 What is sound
how it is produced? ਧੁਨੀ ਕੀ ਹੈ ਇਹ ਕਿਵੇਂ
ਹੁੰਦੀ ਹੈ ? 3 What are uses and working
of SONAR? ਸੁਨਾਰ ਦੀ ਕਾਰਜ ਵਿਧੀ ਅਤੇ
ਉਪਯੋਗਾਂ ਦਾ ਵਰਣਨ ਕਰੋ।
Hour
॥​

Answer 1

Answer:

The defining criterion for a mechanical wave is that it needs a material medium like air, water and metals for its propagation. Sound waves need a medium for their propagation.

Answer 2

Answer:

sound waves are mechanical waves because they need a material medium for propagation like air , liquid like water & metal like silver