An x-ray and a radio wave are both shot into outer space (they both travel in vacuum). What is the difference between the two signals? Select all that apply. * x-ray has a higher frequency
x-ray has more energy
x-ray is faster
x-ray has a higher 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.