Which characteristic of a light wave must increase
as the light wave passes from glass into air?
(1) amplitude (3) period
(2) frequency (4) wavelength

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.