3. The speed of Wave 1 is 100 cm/s, frequency 10. The frequency of Wave 2 is 300, while its speed is twice that of Wave 1. Which of the following is right?
A. The wavelengths of the two are equal.
B. The wavelength of Wave 1 is 10 times longer than that of Wave 2.
C. The wavelength of Wave 2 is longer than that of Wave 1.
D. The wavelength of Wave 1 is longer than that of Wave 2.
答案解析:答案为D。本题为计算题。按照后文提到的公式 “Speed = wavelength × frequency” 即可计算出答案为D。
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