Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test General Science Physics Wave

Sonic boom is produced when a source of sound travels at a speed:

1
greater than the speed of sound.
2
greater than the speed of light.
3
lesser than the speed of sound. 
4
More than one of the above
5
None of the above
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