We are not yet capable of detecting life on planets around other stars. But as our technology develops, our first real chance of detecting such life will probably come from ________
A) determining the orbital properties of the planets
B) examining high-resolution images of the planets made by orbiting telescopes
C) examining spectral lines from the atmospheres of distant planets
D) sending spacecraft to study the planets up close
C
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What age does radiometric dating give for Moon rocks and meteorites?
a. zero b. about 6000 years c. about 4 million years d. about 4 billion years e. about 14 billion years
Which of the following is a conservative force? (All refer to a car on a slope.)
a. The force you exert on the car pushing it uphill. b. The force exerted by rain drops falling on the car. c. The frictional force of the road on the car. d. The gravitational force acting on the car. e. The force you exert on the car (pushing it uphill) after it starts to slide downhill.
Dispersion occurs when:
a. a material changes some frequencies more than others. b. a material slows down some wavelengths more than others. c. some materials bend light more than other materials. d. light has different speeds in different materials.
(a) What is the frequency of an EM wave that has a wavelength of 1 millimeter? (b) What type of EM wave is this?