The ozone layer is
a. transparent to ultraviolet radiation.
b. opaque to ultraviolet radiation.
c. opaque to visible light.
d. opaque to infrared radiation.
e. responsible for producing most of the oxygen that animal life needs.
b
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The temperature coefficient of resistivity of iron is 5.0 × 10^-3 / °C; that of carbon is -0.50 × 10^-3 / °C. When an iron wire and a carbon rod, each having the same 10 W resistance at 20°C, are cooled from that temperature to -80°C, the new ratio of the resistance of the carbon rod to the resistance of the iron wire at the lower temperature is
a. -0.10. b. +1.9. c. +2.1. d. -10. e. +10.
If two stars are emitting the same amount of light, the star that is farther will appear dimmer
a. True b. False Indicate whether the statement is true or false
Which of the following is an example of a true "wave", as that word is used in physics?
A) A water wave that is coming into the beach, like the waves that surfers use to surfboard on B) A stream flowing downhill over rocks C) Both of the above. D) None of the above.
An electron in a hydrogen atom makes a transition from the n = 3 to the n = 1 energy state. Determine the wavelength of the emitted photon (in nm)
a. 1 006 b. 209 c. 306 d. 103 e. 821