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प्रश्न
What changes when an electromagnetic wave travels from one medium to another?
विकल्प
Speed and wavelength change; frequency does not change.
Frequency and speed change; wavelength does not change.
Frequency and wavelength change; speed does not change.
Speed, wavelength, and frequency all change.
MCQ
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उत्तर
An electromagnetic wave keeps the same frequency when it enters another medium. Only its speed and wavelength change.
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