How are the speed v of a wave, its wavelength , and its period T related?
a. v = T
b. v = - T
c. v = 0
d. v = /T
e. v = T/
d
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In a vacuum, which form of electromagnetic radiation travels slowest?
A) Visible light B) Radio C) Gamma rays D) Ultraviolet light E) All forms of electromagnetic radiation travel at the same speed.
Two transparency sheets are rubbed with tissue paper and then the two transparency sheets are held up near each other. This experiment demonstrates that
A) similarly-charged objects attract each other. B) similarly-charged objects exert magnetic forces on each other. C) differently-charged objects attract each other. D) differently-charged objects repel each other. E) similarly-charged objects repel each other.
The coldest region of the atmosphere is the
a. stratosphere. b. troposphere. c. mesosphere. d. thermosphere.
A 1 000-V battery, a 3 000-? resistor and a 0.50-µF capacitor are connected in series with a switch. The time constant for such a circuit, designated by the Greek letter, ?, is defined as the time required to charge the capacitor to 63% of its capacity after the switch is closed. What is the value of ? for this circuit?
a.
6.0 × 109 s
b.
1.7 × 10?10 s
c.
1.7 × 10?7 s
d.
1.5 × 10?3 s