本题目来源于试卷: Wave Basic Concepts，类别为 美国物理杯赛(Physics Bowl)
[单选题]
06.28: A radio signal wimtj6 kvf3s1f)/n6pzc* k-c,q0 d hvmfth a wavelength of $1.2 × 10^{−4}\:m$ is sent to a distance asteroid, is reflected, and returns to Earth 72 hours and 48 minutes later. How far from Earth is the asteroid?
A. $1.9\times\:10^{10}\:km$
B. $3.9\times\:10^{10}\:km$
C. $7.9\times\:10^{10}\:km$
D. $1.9\times\:10^{11}\:km$
E. $5.4\times\:10^{11}\:km$
参考答案: B
本题详细解析:
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