Compared to a sound of 40 decibels, the intensity of a sound of 50 decibels is
A) 10 times as much.
B) 100 times as much.
C) 1000 times as much.
D) 10,000 times as much.
E) more than 10,000 times as much.
Answer: A
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Suppose we put a 0.3-kg hunk of ice at 0°C into an insulating thermos bottle filled with 1000 g of water at 20°C. What will be the system’s final temperature?
A. Below 0°C B. Almost exactly 0°C C. Somewhat above 0°C, but below 10°C D. Very roughly 10°C E. Somewhat below 20°C, but above 10°C F. Almost exactly 20°C
Communications satellites are synchronous satellites that orbit Earth each
A. 90 minutes B. 24 hours C. 28 days D. They don't orbit Earth, they just stay in one place.
The type of mirror that will allow you to see large areas normally hidden from your view is __________
Fill in the blank(s) with correct word
Increasing the brightness of a beam of light without changing its color will increase
A) the number of photons per second traveling in the beam. B) the energy of each photon. C) the speed of the photons. D) the frequency of the light. E) the wavelength of the photons.