Which of the following statements are correct with respect to the electromagnetic waves in an is...

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Which of the following statements are correct with respect to the electromagnetic waves in an isotropic medium?
(A) Energy due to electric field is equal to that due to magnetic field.
(B) Electric vector \( E \) and magnetic vector \( B \) are in phase.
(C) For a given amplitude of \( E \) vector, the intensity increases as the first power of frequency \( f \).
(D) For cylindrical wave fronts, the amplitude of the wave varies in proportion to \( 1 / r^{2} \), where \( r \) is the radius of the wave front.
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