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(a) What is the upper limit of frequency of human hearing ? (b) What is the lower limit of frequency of human hearing ? (c) Name one animal which can produce ultrasonic sounds. (d) Name two animals which can hear ultrasonic sounds. |
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Answer» (a) What is the upper limit of frequency of human hearing ? (b) What is the lower limit of frequency of human hearing ? (c) Name one animal which can produce ultrasonic sounds. (d) Name two animals which can hear ultrasonic sounds. |
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