EASY
AS and A Level
IMPORTANT
Earn 100

 Define radiant flux intensity.

Important Questions on Astronomy and Cosmology

EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 31 - Astronomy and Cosmology>EXAM-STYLE QUESTIONS>Q 7
(b) State the relationship between radiant flux intensity F and distance d from the centre of a star.
EASY
AS and A Level
IMPORTANT
Physics for Cambridge International AS & A Level Coursebook 3rd Edition Digital Access>Chapter 31 - Astronomy and Cosmology>EXAM-STYLE QUESTIONS>Q 7

Neptune is the farthest known planet from the Sun in the Solar System. Its distance from the Sun is 30 times greater than the distance of the Earth from the Sun. The radiant flux intensity from the Sun at the Earth is 1400 W m-2.

A space probe is close to Neptune.

Calculate the maximum radiant power received by an instrument of cross-sectional area 1.0 cm2 on this space probe.