本题目来源于试卷: Vibrations and Waves，类别为 IB物理学
[问答题]
Give two reasons why circular water h )gm76bjepb vj t;(a*waves decrease in amplitude as 42c xn9ko tz7uthey travel away fc9 tuo7zn 2kx4rom the 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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