Electromagnetic waves of wavelength λ and frequency f travel at speed c in a vacuum. Which of the following describes the wavelength and speed of electromagnetic waves of frequency f/2?
1 )
wavelength= λ/2 | speed in a vacuum= c/2
2 )
wavelength= λ/2 | speed in a vacuum= c
wavelength= 2λ | speed in a vacuum= c
4 )
wavelength= 2λ | speed in a vacuum= 2c
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