What is the grating spacing?
The grating space is the width of one slit.
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You can reason that the time required for a ball to fall is related to the height from which it falls and to the acceleration due to gravity. Time is measured in seconds, height in meters, and gravitational acceleration. Using dimensional analysis, determine how the time to fall from height h compares to the time required to fall from height 2h.
A. It takes 1/2 as long
B. It takes 4 times as long
C. It takes 
times as long
D. It takes 2 times as long
E. It takes 
as long
F. It takes 1/4 as long
During the nuclear fusion of hydrogen to helium in the core of our Sun, what percentage of the original mass of the hydrogen is converted into energy?
A) 0.7% B) 0.07% C) 70% D) 100%
The pupil of the human eye is approximately 0.8 cm in diameter when adapted to the dark. The ratio of the light-gathering power of a 1.6-m telescope to that of the human eye is ____
a. 2 b. 4 c. 20 d. 400 e. 40,000
Why is the Moon's cycle of phases (the synodic month) longer than the Moon's orbital period (the sidereal month)?
A) The Moon completes the cycle of lunar phases before it completes a full orbit around Earth. B) The Moon has to complete more than one full orbit around Earth to complete the cycle of lunar phases. C) The Moon orbits Earth faster than Earth orbits the Sun. D) The Moon orbits Earth faster than Earth rotates. E) The lunar month is based on the Moon's orbit, while the sidereal month is based on Earth's orbit.