Answers to Physics Module Questions - Module #29

1. To most efficiently absorb an electromagnetic wave, the frequency of the wave should be ___ the natural frequency of the material being used to absorb the wave.
1. greater than
2. less than
3. equal to
4. zero compared to
5. infinite compared to
6. none of the above
7. all of the above

2. When electron clouds in a material are made to oscillate ____ waves are necessarily emitted
1. electronic
2. magnetic
3. de Broglie
4. electromagnetic
5. sound
6. ocean
7. ultraviolet

3. A surface that appears smooth to one kind of waves can appear rough to another kind of waves whose wavelength is ____ compared to the first kind.
1. zero
2. infinite
3. smaller
4. larger
5. the same
6. all of the above
7. none of the above

4. The bottom of a swimming pool appears closer to the surface than it actually is. This is caused by ___ of light.
1. refraction
2. fraction
3. reflection
4. flection
5. absorption
6. sorption
7. denaturization

5. About 9 AM, in the morning, a beam of sunlight enters the water of your swimming pool. The beam necessarily bends ___ as it enters the water.
1. by zero degrees
2. by 180 degrees
3. by 90 degrees
4. towards the normal
5. away from the normal
6. none of the above
7. all of the above