本题目来源于试卷: gc textbook chapter 11 Vibrations and Waves，类别为 通用国际物理
[问答题]
Give two reasons why circular .sk2 9nxcysn23 oi7ri water waves decrease c0 1 qv*x13cjtcfc7 qnin amplitude as they travel away from tj qc301ccqx*fnt 71cvhe source.
参考答案: (a) Similar to the discussion in section 11-9 for spherical waves, as a circular wave expands, the circumference of the wave increases. For the energy in the wave to be conserved, as the circumference increases, the intensity has to decrease. The intensity of the wave is proportional to the square of the amplitude (b) The water waves will decrease in amplitude due to dissipation of energy from viscosity in the water (dissipative or frictional energy loss).
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