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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class12  >>  Electromagnetic Waves
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If $ V_x , V_m\: and\: V_r$ respectively are the speed of X-rays, microwaves and radio waves in air, then

$\begin {array} {1 1} (a)\;V_x > V_m > V_r & \quad (b)\;V_x < V_m < V_r \\ (c)\;V_x = V_m > V_r & \quad (d)\;V_x = V_m = V_r \end {array}$

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Electromagnetic waves of all frequencies travel with same speed in air.
Ans : (d)
answered Feb 25, 2014 by thanvigandhi_1

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