As you recede from a steady light source, the wavelength of the emitted light appears
A) longer.
B) shorter.
C) the same.
Answer: A
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Which of these lamps is the longer lasting in a common circuit?
A) incandescent lamp B) compact fluorescent lamp C) light-emitting diode D) all about the same
Which of the following actions would double the magnitude of the magnetic force per unit length between two parallel current-carrying wires? Choose all correct answers
(a) Double one of the currents. (b) Double the distance between them. (c) Reduce the distance between them by half. (d) Double both currents.
1.(a) only 2.(a) and (c) 3.(b) and (d) 4.(c) and (d)Arvin the Ant travels 30 cm eastward, then 25 cm northward, and finally 10 cm westward. In what direction is Arvin now in with respect to his starting point?
a. 59° N of E c. 29° N of W b. 29° N of E d. 51° N of E
After a powder-processed part is pressed, and before it is sintered, it is called a(n) ___________compact.
Fill in the blank(s) with the appropriate word(s).