Which one of the following is the correct number for the magnification of a plane mirror?
A) 1.0
B) 0.25
C) 0.5
D) 1.5
E) 2.0
A
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Cathode rays are
A. x-rays.
B. 
-rays.
C. electrons.
D. protons.
E. neutrons.
Ideal Gas Law: A 4.2-L flask of ideal neon gas (which is monatomic) is at a pressure of 3.3 atm and a temperature of 450 K. The atomic mass of neon is 20.2 g/mol. How many neon atoms are in the flask? (R = 8.31 J/mol ? K, 1 atm = 101 kPa, NA = 6.022 × 1023 molecules/mol)
A. 2.3 × 1023 B. 2.3 × 1022 C. 6.9 × 1023 D. 2.3 × 1025 E. 6.9 × 1022
A ping-pong ball collides with a bowling ball. Which experiences the greatest force?
A. the ping-pong ball B. the bowling ball C. they experience the same force D. the force on each E. the force on each depends on depends on its velocity its mass
A very loud train whistle has an acoustic power output of 100 W. If the sound energy spreads out spherically, what is the intensity level in dB at a distance of 89.0 meters from the train? (I0 = 10?12 W/m2)
a. 20.7 dB b. 70.0 dB c. 90.0 dB d. 95.0 dB e. 207 dB