This holiday season, spark a lifelong love of learning. Gift Brilliant Premium

Star Shining Bright

A cepheid variable star's brightness can be predicted by observing the period over which its luminosity varies.

A particular cepheid variable is found by this method to have a luminosity of 4×1031 W4\times 10 ^ {31} \text{ W}. The intensity of its light on Earth is 0.00025 W/m20.00025 \text{ W/m}^2. How far away is the star in metres?

×

Problem Loading...

Note Loading...

Set Loading...