Microwave ovens work mainly by exciting molecules of the substance named ______________
Fill in the blank(s) with correct word
water
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Two organ pipes are meant to be the same length, but apparently they are not. When played simultaneously the beat frequency heard is 2.4 Hz. If the fundamental frequency of the first pipe is 228 Hz, by what fraction is the first pipe different in length than the second?
A. 2% B. -2% C. -1% D. Impossible to determine E. 1%
A planetary nebula is the disk of matter around a star that will eventually form a planetary system.
Indicate whether the statement is true or false
Copernicus believed the Earth was the center of all celestial motion
Indicate whether the statement is true or false
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 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.