4. Intensity is defined as Power/ Area\' where I put \'Area\' in quotes because

Question

4. Intensity is defined as Power/ Area' where I put 'Area' in quotes because it does not always have units of meters. The ‘Area' here simply means the size measure of the shape of the wavefront. a) If you drop a rock in a pond, you will produce waves with circular wavefronts (i.e. the wave crest looks like a circle). What would ‘Area' be for this situation? Area' be for this situation? would ‘Area, be for this situation? b) If you strike a bell, you will produce waves with spherical wavefronts. What would c) If you turn on a small incandescent light bulb, what shape will the wavefronts be? What

Explanation / Answer

a) plane circular wave

Area=r^2

b) surface area of spherical wave =4*r^2

c) spherical arcs

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