8. Light has a frequency closeet to: A. 10 Hz B. 10 Ha C. 0.5 nm D. 10% Hz E. 10

Question

8. Light has a frequency closeet to: A. 10 Hz B. 10 Ha C. 0.5 nm D. 10% Hz E. 101" Hz 9. Sound waves can travel long distances in the tropopause because A. The sound of speed is similar above and below B. The sound of speed is lower above and below C. The speed of sound is higher above and below D. The sound of speed is lower above and higher below 10. Soap bubbles are thin films. They are colorful because of A. Refraction B. none of these C. Reflection D. Diffraction E. Interference 11. The photoelectric effect tells us that some metals will emit electrons when A. a photon with a frequency less than a certain frequency shines upon them B. a photon with a frequency greater than some minimum shines upon them. C. a photon with a wavelength greater than some minimam shines upon them. D. a photon shines on tbe metal and cause more electrons to be emitted. 12. CAT scans are responsible for how many new cancers per year in the U.S.? A. 300,000 B. 30,000 C. 0 D. 300 E. 3000 13. Which Energy source has declined in global output in the recent years? A. Coal B. Nuclear Energy C. Crude Oil D. Hydroelectric E. None of these 14. Dark energy A. Is the reason why the night sky is dark B. Is a mysterious source of mass that clumps around galaxies C. Accounts for 23% of all of the universe's energy D. Is a mysterious negative-pressure that seems to be causing the universe to expand at an increasingly rapid rate E. Accounts for 4% of all the universe's energy

Explanation / Answer

8) (E) 1014 Hz

10) (E) Interference

11) (B) A photon with a frequency greater than some minimum shines upon them.

12) Survey question.

13) (A) Coal

14) (D)

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