A sound level of 80 dB has ___________ the amplitude of a 60 dB sound
a. ten times b. twenty times
c. one tenth d. twice
a
Physics & Space Science
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A radioactive isotope with an atomic number of 90 undergoes beta decay. What is the atomic number of the daughter nucleus?
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The horizontal speed of a projectile
a. is zero. b. stays constant. c. continuously increases. d. continuously decreases. e. sometimes decreases and sometimes increases.
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An ideal Carnot air conditioner operates between an indoor temperature of 20°C and an outdoor temperature of 39°C. How much energy does it use to remove 2000 J of heat from the interior of the house?
A) 105 J B) 130 J C) 780 J D) 520 J E) 340 J
Physics & Space Science