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A bat flying above lake emits ultrasonic...

A bat flying above lake emits ultrasonic sound of 100 kHz ,When this wave falls on the water surface, it is partly reflected and partly transmitted .The wavelengths of the reflected and the transmitted waves are (The speed of sound in air is 340 m/s and in water is 1450 m/s)

A

` 6.8 ` mm and 2.9 mm

B

3.4 mm and 1.45 cm

C

3.4 mm and 7.8 mm

D

6.8mm and 1.45 cm

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The correct Answer is:
B
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TARGET PUBLICATION-WAVE MOTION -MCQ 7.1
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  2. The equation of a wave is y=A sin (2pint) When it is reflected at a f...

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  3. A bat flying above lake emits ultrasonic sound of 100 kHz ,When this w...

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  8. Consider ten identical sources of sound. All giving the same frequency...

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  10. The amplitude of a wave represented by displacement equation y=(1)/(sq...

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  11. If two waves x1 =A sin (omegat -0.1 x ) and x2 A sin (omegat -0.1x -p...

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  19. Two vibrating tuning forks produce prograssive waves given by y1 = 4s...

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