The Solar System and orbits

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Question 8
Medium

A planet orbits a nearby star.

The power output of the star is 1.2 × 1026 W. The average distance of the planet from the star is 1.8 × 1011 m.

The intensity of radiation, III, at a distance d d\,d from a star of power P P\,P can be calculated using the equation:

I=P4πd2 I = \frac{P}{4 \pi d^2} I=4πd2P​

Calculate the intensity of the radiation from the star at the planet's orbit.

Give your answer to 2 significant figures and state the appropriate unit.

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The Solar System and orbits Questions

  1. GCSE
  2. /Physics
  3. /The Solar System and orbits