__________ radiation causes your skin to tan
Fill in the blank(s) with correct word
Ultraviolet
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Which has the smaller critical mass; U-235 that releases 2.5 neutrons per fission, or Pu-239 that releases 2.7 neutrons per fission?
A) U-235 B) Pu-239 C) both would have the same critical mass.
A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the acceleration of the car has components of 2.4 m/s2 east and 1.8 m/s2 south. What is the radius of the circle?
a. 0.24 km b. 0.19 km c. 0.32 km d. 0.14 km e. 0.27 km
According to conservative estimates, the end of habitability of Earth will come about
A) 3 to 4 billion years from now B) a few hundred thousand years from now C) 100 million years from now D) a billion years from now
What is the intensity level of a sound with intensity of 6.0 × 10^?10 W/m2? ( I0 = 10?12 W/m2 )
a. 20 dB b. 64 dB c. 2.8 dB d. 28 dB e. 6.4 dB