1) Timmy noticed that light from the lamp spreads out and fills the whole room. When it does that, light is acting more like a) gravity. b) a particle. c) a wave. d) heat. 2) In which example is light acting more like a particle? a) Light fades when it is farther from you. b) Lamp light spreads out in all directions. c) Light can have constructive interference. d) Light bounces off a mirror. 3) In 1926, Michelson was able to measure the speed of light using a) lanterns. b) stars. c) mirrors. d) sunlight. 4) Which of the following is NOT an electromagnetic wave? a) Gamma b) Sound c) Radio d) Light 5) Which of these has the longest wavelength? a) Microwaves b) Light waves c) Gamma d) X-rays 6) What is the speed of microwaves? a) 340 m/s b) 300,000 km/s c) 18,000 mi/hr 7) The source of all electromagnetic waves is a) magnetic fields. b) heat. c) electric fields. d) vibrating charges (atoms/electrons) 8) Light travels 300,000 km/s. How far is a light-minute? a) 5000 km b) 300,000 km c) 400,000 km d) 18,000,000 km 9) When we look at the whiteboard in front of the classroom, we are seeing light that  a) is a few minutes old. b) has been traveling for years c) is a tiny fraction of a second old. 10) Which of the following travels about 300,000 km/s in a vacuum? CHECK ALL THAT APPLY. a) light waves b) radio waves c) microwaves d) all of these 11) A light-year is a unit that measures time. a) True b) False 12) Light DOES transmit through what kind of objects? a) transparent ones b) opaque ones 13) Could you get sunburned in a greenhouse made of ordinary glass? a) Yes b) No c) Yes, but only in the summer. 14) Clouds will a) absorb all UV light and change it to heat b) B. block all UV light. c) allow some UV light to pass through.

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