10. A light source emits a light wave with frequency ∫₀ to an observer. At the same time, the observer moves toward the light source with speed v = 1/2 c, where c is the speed of light. What is the frequency observed by the observer? (A) (B)(C) f₀ (D)(E)

10. A light source emits a light wave with frequency ∫₀ to an observer. At the same time, the observer moves toward the light source with speed v = 1/2 c, where c is the speed of light. What is the frequency observed by the observer?

(A)
(B)
(C) f₀
(D)
(E)

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詳解 (共 1 筆)

助人為本

B1 · 2026/07/13

#7441777

所以這題考的是光的都卜勒效應

所以靠近的時候我們要代的公式分子放1+B

遠離的時候我們要代的公式分子放1-B

所以可以得到公式整理

複選題12. Which ones of the following statements of the second law of thermodynamics are wrong? (A) No cyclical heat engine has a greater efficiency than a reversible engine operating between the same two temperatures. (B) It is impossible for a cyclical device to transfer heat continuously from a hot body to a cold body without the input of work or other effect on the environment. (C) It is impossible for a heat engine that operates in a cycle to convert its work input completely into heat. (D) In a reversible process the entropy of an isolated system stays constant; in an irreversible process the entropy decreases. (E) In a reversible process the entropy of an isolated system increases; in an irreversible process the entropy stays constant.

10. A light source emits a light wave with frequency ∫₀ to an observer. At the same time, the observer moves toward the light source with speed v = 1/2 c, where c is the speed of light. What is the frequency observed by the observer?

(A)
(B)
(C) f₀
(D)
(E)

詳解 (共 1 筆)

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