If a baseball were scaled up to the size of planet Earth, each of its atoms would be about the size of
A) a baseball stadium.
B) a flea.
C) an atom.
D) a ping-pong ball.
Answer: D
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Isotopes have the same number of
A) protons and neutrons B) protons but a different number of electrons C) neutrons but a different number of protons D) protons but a different number of neutrons
One light-year is about 10 trillion kilometers
Indicate whether the statement is true or false
A long solenoid (1 000 turns/m) carries a current of 25 mA and has an inside radius of 2.0 cm. A long wire which is parallel to and 4.0 cm from the axis of the solenoid carries a current of 6.0 A. What is the magnitude of the magnetic field at a point on the axis of the solenoid?
a. 51 mT b. 61 mT c. 43 mT d. 81 mT e. 1.4 mT
Intensity of Sound: By how many decibels does the intensity level of a sound increase when you triple the intensity of a source of sound?
A. 9.5 dB B. 4.8 dB C. 6.0 dB D. 3.0 dB E. 12 dB