Rays from a distant object do not diverge enough for a nearsighted person to focus; this can be corrected with a
A. converging or positive lens.
B. diverging or positive lens.
C. converging or negative lens.
D. diverging or negative lens.
Answer: D
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A stretched string is observed to have four equal segments in a standing wave driven at a frequency of 480 Hz. What driving frequency will set up a standing wave with five equal segments?
A) 240 Hz B) 600 Hz C) 360 Hz D) 120 Hz
The banking of curves increases the chance of skidding
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The United States consumes 2.5 × 10^19 J of energy each year. A typical solar flare releases 5.0 × 10^24 J of energy. How many years could we run the United States on the energy released by this solar flare if all of the released energy could be used?
a. 5 × 10^-6 years b. 200,000 years c. 1.25 × 10^44 years d. about 12 years e. 500 years
Sunspots are only about 2,000 K cooler than the much brighter photosphere
Indicate whether the statement is true or false