List of top Physics Questions on Electromagnetic waves asked in KEAM

The direction of propagation of electromagnetic wave is along

The velocity of sound is v at 273 K. The temperature at which it is 2v is

The dielectric constant of air is $ 1.006 $ . The speed of electromagnetic wave travelling in air is $ a\times {{10}^{8}}m{{s}^{-1}}, $ where a is about