Which of the following effects can be used to produce ultrasonic waves? a) Magnetostriction effect b) Doppler Effect c) Magnetic effect d) Sound effect

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Q: A pendulum has a period of 5 seconds. What is its frequency? 0.2 Hz 5 Hz 25 Hz 1 MHz

A: We know thatf=1THeref=frequencyT=time period

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Q: What physical quantity is transferred by a wave?   light sound energy vectors

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