When the nucleus of an atom emits an alpha particle, the atom's atomic number
A) decreases.
B) remains unchanged.
C) increases.
Answer: A
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The source of energy that illuminates a lamp in your home is
A) the power company. B) the electrical outlet. C) atoms in the bulb filament. D) the wire leads to the lamp. E) the source voltage.
An object is placed 15 cm in front of a diverging lens whose focal length is 12 cm. Where will the image be located (in cm)?
A. ?6.7 B. ?7.2 C. ?0.15 D. ?60 E. ?5.0
An impact crater that is 10 kilometers across was probably made by the impact of an object about ________ across.
A) 10 meters B) 100 meters C) 1 kilometer D) 10 kilometers E) 100 kilometers
Which of the following forces are exerted on a satellite that is in orbit around Earth?
A. an attractive gravitational force directed toward the center of Earth B. a force in the direction of the satellite's motion C. an outward force directed away from the center of Earth D. a and b