Two tuning forks with frequencies 264 and 262 Hz produce "beats". What is the beat frequency (in Hz)?
a. 4
b. 2
c. 1
d. 3
e. 0 (no beats are produced)
b
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A common inactive ingredient in products such as sunscreen lotions and shampoo is triethyl amine, also known as TEA. Which of the following is the chemical structure for this compound?
A) a B) b C) c D) d
Which force field can both accelerate an electron and change its speed?
A) electric field. B) magnetic field. C) both of these D) none of the above
Jack rides a bicycle northward at 12 mph. Jill rides southward on the same road at 12 mph. As they pass each other
A) their speeds are identical and their velocities are identical. B) their speeds are identical but their velocities are different. C) their speeds are different but their velocities are identical. D) their speeds are different and their velocities are different. E) theoretical physics predicts, surprisingly enough, that they will turn into giant frogs.
Starburst galaxies
a. contain a large number of very young stars, but very little evidence of gas clouds. b. contain a large number of very old stars and almost no gas or dust. c. are often associated with a galaxy that is colliding with another galaxy. d. are common in rich clusters. e. are composed of filaments and voids.