[领域] 波动 [来源] 原文书 [题目] The period of pulsating variable star may be estimated by considering the star to be executing radial longitudinal pulsations in the fundamental standing wave mode;that is, the star's radius varies periodically with time, with a displacement antinode at the star's surface. (a) Would you expect the center of the star to be a displacement node or antinode? (b) By analogy with a pipe with one open end, show that the period of pulsation T is given by T=4R/v, where R is the equilibrium radius of the star and vis average sound speed in the material of the star. (c) Typical white dwarf stars are composed of material with a bulk modulus of 1.33x10^22 Pa and a density of 10^10 kg/m^3. They have radii equal to 9x10^-3 solar radius. What is the approximate pulsation period of a white dwarf? [瓶颈] 题目看不太懂 这题是在说 1个星星它发出的波接近於 1开1闭的管子所能产生的波吗? 不知道是不是 麻烦高手帮忙一下 谢谢!! --

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