Refracting Telescope: The objective lens of a telescope has a focal length of 2.0 m and its eyepiece has a focal length of 1.0 cm. What is the magnification of this telescope when viewing Jupiter?
A. 0.0050
B. 0.50
C. 2.0
D. 20
E. 200
Answer: E
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Transformers: An ideal step-down transformer is needed to reduce a primary voltage of 120 V to 6.0 V. What must be the ratio of the number of turns in the secondary to the number of turns in the primary?
Fill in the blank(s) with the appropriate word(s).
A tuning fork of frequency 200 hertz can resonate if an incident sound wave has a frequency of
A) 100 hertz. B) 200 hertz. C) both of these D) neither of these
The term Cambrian explosion refers to
a. an asteroid impact. b. the breakup of a supercontinent. c. intense, widespread volcanic activity. d. a proliferation of life forms.
As a helium-filled dirigible rises in the atmosphere, the buoyancy force is expected to
A) increase. B) remain constant. C) decrease.