Electromagnetic...

It is necessary to use satellites for long distance TV transmission because

Optical and radio telescopes are built on the ground, but X-ray Astronomy is possible only from satellites orbiting the earth because

The small ozone layer on top of the stratosphere is crucial for human survival because

If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now ?

Some scientists have predicted that a global nuclear war on the earth would be followed by a severe ‘nuclear winter’ with a devastating effect on life on earth. What might be the basis of this prediction?

Do EM waves need a medium to travel through?

Electromagnetic radiation

High intensities of UV light

Which of these methods is better to reduce effects of ultra violet light?

When white light is split into its component colors by a prism