Elementary Particles: How many quarks are in a tritium isotope, 
H?
A. 2
B. 3
C. 4
D. 6
E. 9
Answer: E
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A truck moving at 36 m/s passes a police car moving at 45 m/s in the opposite direction. If the frequency of the siren is 500 Hz relative to the police car, what is the frequency heard by an observer in the truck after the police car passes the truck? (The speed of sound in air is 343 m/s.)
a. 361 b. 636 c. 393 d. 396 e. 383
Electric generating plants are usually rated in "megawatts". This is a unit of
A) force. B) power. C) energy. D) both energy and work. E) work.
Even if the Universe has no edge, it has a center
a. True b. False Indicate whether the statement is true or false
Which of the following transitions in hydrogen produces the photons with the longest wavelengths in the Balmer series?
1. n = 6 to n = 2 2. n = 6 to n = 3 3. n = 3 to n = 2 4. n = 2 to n = 1