Why are optical fibers important for communication?
a. They can carry thousands of times the information that wires can.
b. Light goes faster than electricity.
c. They carry digital information. Wires can't carry digital information.
d. all of the above
A
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A length of piano wire is used to hang a mass from the ceiling. If the total mass of the string is 0.72 g and the mass hung from it is 1850 g, what is the length of the wire, assuming the fundamental frequency when plucked in these circumstances is 1280 Hz?
A. 2.48 cm B. 6.15 cm C. 3.08 cm D. 1.54 cm
Light from white dwarfs shows a gravitational redshift
Indicate whether the statement is true or false
The power of a lens is 4.0 diopters. What is the focal length of this lens?
A) 25 cm B) 55 cm C) 40 cm D) 20 cm E) 60 cm
The origin of Earth's primitive ozone layer
A) is attributed to photosynthesis. B) traces back to the Cambrian period. C) is attributed to volcanic eruptions. D) helped to form the oceans.