Question
In what setting do all frequencies of electromagnetic waves travel at the same speed?
A.
in empty space
B.
in the atmosphere
C.
in the laboratory
D.
in all settings
A.
in empty space
B.
in the atmosphere
C.
in the laboratory
D.
in all settings
Answers
GPT-5 mini
A. in empty space
Explanation: In vacuum (empty space) all electromagnetic waves travel at the same speed c ≈ 3.00×10^8 m/s, regardless of frequency. In materials (e.g., atmosphere or lab media) the refractive index depends on frequency, causing dispersion and frequency-dependent speeds.
Explanation: In vacuum (empty space) all electromagnetic waves travel at the same speed c ≈ 3.00×10^8 m/s, regardless of frequency. In materials (e.g., atmosphere or lab media) the refractive index depends on frequency, causing dispersion and frequency-dependent speeds.