Refracting Telescope: A student constructs an astronomical telescope with a magnification of 10. If the telescope has an objective lens of focal length 0.50 m, what is the resulting length of the telescope?
A. 53 cm
B. 55 cm
C. 60 cm
D. 75 cm
Answer: B
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A primary reason for you to learn science, according to the textbook's opening section, is
A) to increase your awareness. B) to pass on Western culture to the next generation. C) because a broadly educated person can get a better job. D) to increase your intelligence. E) Actually there is no good reason all this scientific nonsense.
Radioactive isotopes are useful for
A) dating the ages of objects. B) tracing the path of certain chemicals. C) cancer therapy. D) All of the above. E) None of the above.
An organ pipe is open at both ends. The frequency of the third mode is 320 Hz higher than the frequency of the second mode. If the speed of sound is 345 m/s, then what is the length of the organ pipe?
A. 64.0 cm B. 62.6 cm C. 57.9 cm D. 53.9 cm E. 50.3 cm
The Carnot engine is important because
A. it was historically the first practical heat engine. B. it shows (in principle) how one can use ideal gas processes to create a perfectly efficient engine. C. it shows (in principle) how one can use ideal gas processes to create a maximally efficient engine. D. it is the only engine that one can run in reverse as a refrigerator. E. some other reason (specify).