Author Question: Light can travel to Earth from a distant star, but sound cannot. Why is this? a. Light is an ... (Read 101 times)

wrbasek0 · **on:** Jul 28, 2018

Light can travel to Earth from a distant star, but sound cannot. Why is this?
a. Light is an electromagnetic wave, and sound requires a medium.
b. The Sun does not make sound.
c. Light is a longitudinal wave, and sound is a transverse wave.
d. The statement is false; both light and sound can travel in empty space.

Question 2

The number of states in the He+ ion corresponding to the principle quantum number n = 5 are
a. 18
b. 25
c. 50
d. 9
e. 11