ICSE /Class 10
Physics MCQ Based On Reflection of sound waves echoes
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ICSE Class 10 Physics Reflection of sound waves echoes
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speed=2d/t⇒d=(speed×t)/2=(350×1)/2=175m.
Since distance is same so V_air t_air=t_water⇒t_water=(V_air t_air)/V_water =1/4.5×4.5=1s.
Since distance is same so V_air t_air=t_water⇒t_water=(V_air t_air)/V_water =1/2×4=2s
Mechanical waves are those waves which needs medium to propagate.
d=Vt/2=(3×〖10〗^(8 )×(0.03×〖10〗^(-3) ))/2=4.5×〖10〗^3 m=4.5km
speed=2d/t⇒d=(speed×t)/2=(350×1.5)/2=262.5m.
330/20=16.5m, 330/20000=16.5 ×〖10〗^(-3) m=16.5mm
RADAR stands for “Radio detection and ranging”.
To detect obstacles in their path, bats produce Ultrasonic waves.
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