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8.Electromagnetic waves
easy
Which of the following is $NOT$ true for electromagnetic waves ?
A
they consist of changing electric and magnetic fields
B
they travel at different speeds in vacuum, depending on their frequency
C
they transport energy
D
they transport momentum
Solution
Electromagnetic wave have constant velocity in a particular medium and it is independant of frequency and it is equal to $V =\sqrt{\frac{1}{\mu_0 \epsilon_0}}=3 \times 10^8\, m / s$
Standard 12
Physics