Which of the following is an example of re?ection or scattering?
A) Red light hits a red sweatshirt.
B) Visible light does not pass through a black wall.
C) Blue light hits a red sweatshirt.
D) Light comes from your computer screen.
A) Red light hits a red sweatshirt.
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A 5.0-? resistor and a 9.0-? resistor are connected in parallel. A 4.0-? resistor is then connected in series with this parallel combination. An ideal 6.0-V battery is then connected across the series-parallel combination of the three resistors
What is the current through (a) the 4.0-? resistor? (b) the 5.0-? resistor? (c) the 9.0-? resistor?
If two stars are emitting the same amount of light and are the same size, the star that is farther will appear
a. brighter. b. dimmer. c. redder. d. bluer. e. They will have the same brightness as seen from Earth.
The primary of a transformer is the coil connected to
A) the load. B) the Internet. C) the input power line. D) none of the above
Suppose that you take the lenses out of a pair of polarized sunglasses and place one on top of the other. Rotate one lens 90° with respect to the normal position of the other lens
Early in the morning, look directly overhead at the sunlight coming down. What would you see? A) The lenses would look completely dark, since they would transmit no light. B) You would see some light, and the brightness would be a function of how the lenses were oriented with respect to the incoming light. C) You would see light with intensity reduced to about 50% of what it would be with one lens. D) You would see some light, and the intensity would be the same as if you had looked through only one lens. E) You would see some light, and the intensity would be greater than if you looked through only one lens.