The primary mirrors of most radio telescopes is similar to the primary mirror of a reflecting optical telescope in that
a. they are both concave in shape.
b. they are both convex in shape.
c. they are typically the same size.
d. they are both made of metal.
e. they have nothing in common.
a
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Mercury presents the same side to the Sun:
A) every other orbit. B) all the time, just like our Moon. C) every 12 hours. D) every third orbit. E) twice every orbit.
Human beings are examples of
A) multicellular eukaryotes B) unicellular prokaryotes C) unicellular eukaryotes D) multicellular prokaryotes
A sensitive ammeter is connected to a wire loop and placed within the magnetic field of a strong horseshoe magnet. The ammeter shows a deflection when:
a. the wire is moved parallel to the field. b. neither wire nor magnet is moving. c. the wire's axis is parallel to the field. d. the wire is moved perpendicularly to the field.
___________is the breakdown of a polymer into simple molecules by bacteria.
Fill in the blank(s) with the appropriate word(s).