Which describes the refraction of a wave?

waves of electromagnetic energy called x-rays pass right through skin and bones.
light changes direction moving through the lens of a magnifying glass.
a wave of sound bounces off a hard surface at the same angle that the wave came in.

=force × distance a. work b. velocity c. pressure d. momentum

Asap and show ! a 14 kg rock starting from rest free falls through a distance of 5.0 m with no air resistance. find the momentum change of the rock caused by its fall and the resulting change in the magnitude of earths velocity. earth mass is 6.0 * 10^24 kg. show your work assuming the rock earth system is closed.

Humidity is to blame for that muggy, steamy feeling you experience on some hot summer days. what gas in the atmosphere causes humidity? a) oxygen b) hydrogen c) nitrogen d) water vapor