Straight line.
no it does not
it does not
no
Yes, they do. But they sometimes travel a straight line through bent space.
it's 180 degrees so it's a straight line
idek
yes
Collinear means lying in the same straight line.
the travel in straight lines because of the atomsphe
The property of light to travel in a straight line is known as rectilinear propagation. This means that light travels in a straight path until it encounters an obstacle or medium that causes it to change direction.
High pitched sounds, like all other sounds, travel in all directions in waves from their source. The direction they travel in can be affected by obstacles, reflections, and other factors, but they do not travel in a perfectly straight line.