The average amount of Solar energy reaching the upper atmosphere of earth per second on an area of 1 m2 is called ___.
The solar energy reaching unit area at outer edge of the earth's atmosphere exposed perpendicularly to the rays of the Sun at the average distance between the Sun and earth is known as
Phases of the moon occur because
(a) we can see only that part of the moon which reflects light towards us.
(b) our distance from the moon keeps changing.
(c) the shadow of the Earth covers only a part of the moon’s surface.
(d) the thickness of the moon’s atmosphere is not constant.
Question 3
(c) the shadow of the Earth covers only a part of moon’s surface.