Which of the following statements is true about electromagnetic radiation? gamma rays travel faster than x-rays in vacuum. x-rays travel faster than gamma rays in vacuum. both gamma rays and x-rays travel at the same speed in vacuum. infrared rays travel slower than both gamma rays and x-rays in vacuum.

An equinox occurs when a. neither end of earth's axis is tilted toward or away from the sun. b. the north end of earth's axis is tilted away from the sun. c. the north end of earth's axis is tilted toward the sun. d. earth's axis is parallel to the sun's rays. select the best answer from the choices provided a b c d