File size is a much greater issue with video than with audio.
Answer the following statement true (T) or false (F)
True
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What substances were found in the innermost regions (within about the inner 0.3 AU) of the solar system before planets began to form?
a. nothing at all b. only rocks and metals c. only hydrogen compounds d. only hydrogen and helium gases e. rocks, metals, hydrogen compounds, hydrogen, and helium, all in gaseous form
Which planet is very hot because of an extreme greenhouse effect?
a) Mars b) Earth c) Venus d) Mercury e) Jupiter
What compelling evidence links pulsars to neutron stars?
A) Both pulsars and neutron stars can be found in globular star clusters. B) Pulsars are known to evolve into neutron stars. C) Only a small, very dense source could rotate that rapidly without flying apart. D) Pulsars are always found in binary systems with neutron stars. E) Both pulsars and neutron stars have been discovered near the Sun.
You are given two converging lenses to build a compound microscope. Lens A has focal length 0.50 cm and lens B has focal length of 3.0 cm. Which one of the two lenses would you use for the objective?
A) Lens A, because it has the shorter focal length. B) Lens B, because it has the longer focal length. C) It makes no difference which lens I use for the objective. D) None, because the objective should be a diverging lens.