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Home » (a) The earth-moon distance is about 60 earth radius. What will be the diameter of the earth (approximately in degrees) as seen from the moon?(b) Moon is seen to be of (½)° diameter from the earth. What must be the relative size compared to the earth?
(a) The earth-moon distance is about 60 earth radius. What will be the diameter of the earth (approximately in degrees) as seen from the moon?
(b) Moon is seen to be of (½)° diameter from the earth. What must be the relative size compared to the earth?
CBSE | Class 11 | NCERT Exemplar | Physics | Units and Measurements
(a) The earth-moon distance is about 60 earth radius. What will be the diameter of the earth (approximately in degrees) as seen from the moon?
(b) Moon is seen to be of (½)° diameter from the earth. What must be the relative size compared to the earth?

(a)

Because the distance between the moon and the earth is greater than the radius of the earth, it is considered as an arc.

Let the length of the arc be R_{e}

Distance between the moon and the earth is given as 60R_{e}

Angle subtended by the diameter of the earth is given as 2^{0}

b) The relative size of the moon when compared to the earth is = diameter of the earth/diameter of the moon = 4

i

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