The yellow clothes of a stage performer appear black when illuminated by light that is
A) red.
B) green.
C) blue.
D) all the above combined
E) none of the above
Answer: C
You might also like to view...
Two large closely-spaced parallel metal plates are uniformly and oppositely charged and the electric field between them is 7.6 × 106 N/C
(a) What is the charge per unit area on each plate? (b) If the plates are now moved two times farther apart, what is the electric field between the plates?
If the minus sign were not in Faraday's law it would lead to a violation of the law of conservation of energy
Indicate whether the statement is true or false
The speed of FM waves will be observed to be c = 2.9979 × 10^8 m/s when the antenna emitting the waves is
a. at rest relative to the receiving antenna. b. moving to the right of the detecting antenna at 0.5 c. c. moving to the left of the detecting antenna at 0.5 c. d. moving as described in (a), (b) or (c) above. e. moving at 2.9979 × 10^8 m/s.
A refrigerator uses mechanical work to transfer heat from a colder region to a hotter one, as shown in this schematic. Why is it not possible to remove heat from the cold region and transfer it to the hot region without the input of work by an external source?
a. It would violate the first law of thermodynamics. b. It would violate the second law of thermodynamics. c. Both a. and b. d. It would be possible only if the machine did not lose some energy as heat because of friction.