1 a hiker is approaching a sheer cliff wall she yodels and, Ask an Expert

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1) A hiker is approaching a sheer cliff wall. She yodels, and hears the echo of her yodel after 3.3 s. How far is she from the cliff?

2) A submarine navigating through the ocean uses sonar to detect a stationary obstacle in front of it. The sonar echo from the obstacle returns to a submarine 1.51 s after being emitted. What is the distance from the submarine to the object creating the echo?

3) While watching carnival masquerade, you measure the intensity of the soca music to be 0.75 W/m^2. What is the corresponding sound level in decibels? (dB)?

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