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

Physics & Space Science

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Cathode rays are

A. x-rays.
B. -rays.
C. electrons.
D. protons.
E. neutrons.

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science