Multiple Choice
What prevented Ole Rømer from calculating an accurate value for the speed of light from his measurements of the delays in eclipse times of Jupiter's moons?
A) The dimensions of the solar system, particularly the length of 1 AU, were known only very inaccurately.
B) Telescopes were not good enough at that time to show Jupiter's moons clearly, and accurate timings were not therefore possible.
C) The distance between Earth's orbit and Jupiter's orbit was unknown.
D) The clocks available at that time were not sufficiently accurate.
Correct Answer:

Verified
Correct Answer:
Verified
Q7: The Balmer series of visible spectral emissions
Q125: Research observatories do NOT use Newtonian reflectors
Q194: Which substance in Earth's atmosphere is the
Q195: How many electrons surround the nucleus of
Q196: If a continuous spectrum of ultraviolet radiation
Q200: What is the reason for the fact
Q201: The MAIN reason for placing a telescope
Q202: A typical refracting telescope is made up
Q204: In general,doubling the diameter of an optical
Q211: Spherical aberration can be corrected or avoided