1. An electric razor completes 60 cycles every second. What is its frequency? What is its period?
2. What is the approximate distance of a thunderstorm when you note a 3 second delay between the flash of lightning and the sound of the thunder?
3. Explain why the
4. A laser beam is reflected by a plane mirror. It is observed that the angle between the incident and reflected beams is 28º. If the mirror is now rotated so that the angle of incidence increases by 5.0 º, what is the new angle between the incident and reflected beams?
5. Light travels a distance of 0.960m in 4.00 ns in a given substance. What is the index of refraction of the substance?
6. Light enters a container of benzene at an angle of 43 º to the normal. The refracted beam makes an angle of 27 º with the normal. Calculate the index of refraction of benzene.
7. An object is placed 25.0 cm away from a concave mirror that has a focal length of 5.00 cm. Where is the image located?
8. An object 3.0 cm tall is placed 20 cm in front of a converging lens. A real image is formed 10 cm from the lens. What is the focal length of the lens?
9. 1. In April of 2019, scientists managed to capture an actual image of a black hole. Explain why scientists have not been able to capture an image before now, and describe what was involved in the process that allowed them to achieve an actual image
10. Bob is stranded on a tropical island. To feed himself, he has carved a fishing spear out of a lovely piece of drift wood. Bob stands in the water waiting for a suitable fish to swim by. Finally, he is in luck. Using your knowledge of light and a nice diagram, explain where Bob should aim his spear to make sure he skewers himself some supper.
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