Which of the following electromagnetic radiations has the highest penetrating power?

Which of these electromagnetic waves is used for communication?

Which of the following shows green house effect

An electromagnetic wave propagating along north has its electric field vector upwards. Its magnetic field vector point towards

An earth orbiting satellite has solar energy collecting panel with total area $5{\rm{\;}}{{\rm{m}}^2}$. If solar radiations are perpendicular and completely absorbed, the average force associated with the radiation pressure is

(Solar constant$= 1.4{\rm{\;kW}}{{\rm{m}}^{ - 2}}$)

Radio waves and visible light in vacuum have

If $c$ is the speed of electromagnetic waves in vacuum, its speed in a medium of dielectric constant $K$ and relative permeability ${{\mu _r}}$ is

X-ray are not used for radar purpose, because they are not

Which of the following rays is emitted by a human body?

Which of the following electromagnetic radiations has the highest penetrating power?

Which of the following electromagnetic waves have minimum frequency