Question

6. Frequencies above 20,000 Hz are called-
sonic
infrasonics
audible
ultrasonics
7.
Speed of sound increases as it passes though-
solid <liquid > gas
gas < liquid < solid
liquid <gas <solid
gas > liquid > solid​

Answer 1

Answer:

which class u are please mention class helpful for giving answer

Answer 2

Explanation:

6. ULTRASONIC

7. GAS< LIQUID < SOLID

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hope it helps...