Assertion: In high latitudes one sees colourful curtains of light hanging down from high altitudes.
Reason: The high energy charged particles from the are deflected to polar regions by the magnetic field of the earth.
if both assertion and reason are true and the reason is the correct explanation of the assertion
if both assertion and reason are true and the reason is not the correct explanation of the assertion
if assertion is true but reason is false
if both assertion and reason are false statements
High-frequency waves are
affected by the solar cycle
reflected by layer
absorbed by the
capable of use for long-distance communication on the moon
The principle of LASER action involves
amplification of particular frequency emitted by the system
population inversion
stimulated emission
All of the above
Through which mode of propagation, the radio waves can be sent from one place to another?
Ground wave propagation
Sky wave propagation
Space wave propagation
All of the above