What is a major disadvantage of optical telescopes?
What will be an ideal response?
They can only be used at night in good weather conditions.
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In size, from largest to smallest, the correct order for the Galilean moons is:
A) Callisto, Ganymede, Europa, Io. B) Ganymede, Callisto, Io, Europa. C) Io, Europa, Callisto, Ganymede. D) Europa, Ganymede, Io, Callisto. E) Ganymede, Callisto, Europa, Io.
Answer the following statement(s) true (T) or false (F)
1. We cannot experimentally determine the actual value of a system’s total energy 2. A system of two noninteracting particles might have a negative total energy E.
If you view a rainbow out your window while riding in a train, you'll see that
A) the rainbow can only be seen while you're moving slowly or at rest. B) the rainbow moves along with you. C) you soon pass by it, leaving it where you first saw it.
Stars are eternal and unchanging in your lifetime but not over a star's lifetime
a. True b. False Indicate whether the statement is true or false