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  3. a. if the intensity of sound from a jet engine is

a. If the intensity of sound from a jet engine is 10 W/m 2 at...

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Physics

a. If the intensity of sound from a jet engine is 10 W/m 2 at adistance of 30 m, how far away from the jet do you have to be forthe intensity to be 0.1 W/m 2 ?

b. Suppose that you hear a clap of thunder 5 s after seeing thelightning stroke. If the speed of sound in the air is 343 m/s andthe speed of light in air is 3 × 10 8 m/s, how far are you from thelightning strike?

c. How long is the time gap between ultrasound reflections fromthe front and back of the heart, assuming the heart to be modeledas a cube of edge length 15 cm?

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