Submit your answers before doing the activities.
Enter your last name, first initial.
Click here to indicate that you've read the assigned material and are answering the reading questions on your own.
1. Describe the function of a capacitor.
2. Describe the correct method for adjusting the position of a flash unit when mounted on the ball-and-socket head on a flash clamp.
3. What are the two vulnerable parts of the Vivitar 283 flash unit?
4. Suppose you plug the AC adapter into a Vivitar 283 but then you can't turn on the power switch. What could explain this?
You've broken the flash unit and will need to make a $75 contribution to the physics department. You didn't plug the AC adapter in far enough. The AC adapter is faulty. No problem. That's the way the flash unit is supposed to work.
5. Describe how to discharge the 283 unit completely.
6. Complete this sentence: For high-speed photography, one generally wants the flash duration to be as .
7. Complete this sentence: In order to obtain the briefest flash of light from a flash unit, one must arrange for the intensity of the reflected light to be .
8. Fill in the blank with one word: How is flash duration related to the brightness of the flash? The greater the duration, the the brightness.
9. If a flash unit is used in mode, the flash duration can be decreased to as low as 20 µs.
10. Two graphs of the intensity of the burst of light from a flash unit vs. time are shown below. Which graph most nearly describes the burst of light that was used for the photograph? The photograph shows a golf ball bouncing up after being dropped onto a table. Explain your answer.
11. What is afterglow?
12. 1 µs (microsecond) = s (second)
When you've finished, click on SUBMIT.