What do infrared and ultraviolet waves have in common? How do they differ?
What will be an ideal response?
Both are forms of electromagnetic radiation, both travel at c in a vacuum, and both are largely absorbed by our atmosphere. They differ greatly in frequency, wavelength, and photon energy, however, with UV much more energetic than IR.
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A ball with original momentum +2.0 kgm/s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is:
a. 0. c. 4.0 kgm/s. b. -4.0 kgm/s. d. -8.0 kgm/s.
Estimation: Estimate the number of times the earth will rotate on its axis during a human's lifetime.
A. 3 × 104 B. 3 × 105 C. 3 × 106 D. 3 × 107 E. 3 × 108
A scientist has discovered a new radioactive element. She finds that the radiation is able to pass through the cardboard box holding the sample, but doesn't pass through the row of steel file cabinets along her wall. The radiation is most likely
A. alpha particles. B. beta particles. C. gamma particles.
You slam on the brakes of your car in a panic, and skid a certain distance on a straight, level road. If you had been traveling twice as fast, what distance would the car have skidded, under identical conditions?
A) It would have skidded 4 times farther. B) It would have skidded 2 times farther. C) It would have skidded times farther. D) It would have skidded 1/ times farther. E) It would have skidded 1/2 as far.