STUDY GUIDE 2, SELF TEST 5

© Department of Physics, University of Guelph.

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1. A source of sound radiates 10.0 watts.

(a) If it is placed at the centre of a sphere 1.00 m in radius, how much power is incident on the sphere?

(b) What power is incident on one square metre of the sphere?

(c) What is the intensity of the sound at a distance of one metre from the source?

(d) What energy is incident on the sphere if the source is turned on for 2.00 s?

2. If the same source as in Q1 is now placed at the centre of a sphere 10.0 m in radius,

(a) how much power is incident on the sphere?

(b) what is the intensity at a distance of 10.0 m from the source?

(c) what power is incident on a 10.0 X 10.0 cm square of the sphere?

(d) If the source is turned on for 3.00 s, how much energy is incident on the square in (c)?

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