How many of the following is/are incorrect?
i. the importance of the equation e = mc2 is that energy has mass.
ii. electromagnetic radiation can be thought of as a stream of particles called photons.
iii. electromagnetic radiation exhibits wave properties.
iv. energy can only occur in discrete units called quanta.

None of the following is correct

Explanation:

Einstein's relation of energy mass equivalence, shows that mass and energy are interchangeable thus holds the importance of both.Electromagnetic radiations are considered to be originating from EM field and hence contains light of different wavelengths in its spectrum such as X-rays, - rays, radio waves, etc.Electro-magnetic radiations follows the principle of duality and hence exhibit both wave and particle nature as in sound and light.Energy can be both in continuous as well as in discrete form.

Rain is pulled by gravity which is a non contact force