A television produces two types of waves: light and sound. Which of the following statements describes a property of both light and sound?

A They can be reflected

B They require a medium.

C They are mechanical
waves.

D They travel at the same speed.

The brightest star in the night sky in the northern hemisphere is sirius. its distance from earth is estimated to be 8.7 light years. a light year is the distance light travels in one year. light travels at a speed of 3.00 × 108 m/s. calculate the distance from earth to sirius in miles. (1 mi = 5280 ft) g