1. Which of the following travel at the same speed as light? (Choose all that apply.)
(a) Radio waves.
(b) Microwaves.
(c) Radar.
(d) Ultrasonic waves.
(e) Infrared radiation.
(f) Cell phone signals.
(g) Gamma rays.
(h) X-rays.
2. Which of the following types of electromagnetic radiation travels the fastest?
(a) Radio waves.
(b) Visible light waves.
(c) X-rays.
(d) Gamma rays.
(e) All the above travel at the same speed.