Which factor in the Drake equation is the most uncertain?
What will be an ideal response?
The lifetime of a technological civilization
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Starting with AC-227, assume the following sequence of decays occur: (1st) ? decay; then (2nd) ?- decay; and finally (3rd) alpha decay. Determine the correct isotopic product after each process has occurred sequentially
What will be an ideal response?
In a double-slit experiment, the distance between the slits is 0.2 mm, and the distance to the screen is 150 cm. What wavelength (in nm) is needed to have the intensity at a point 1 mm from the central maximum on the screen be 80% of the maximum intensity?
a. 900 b. 700 c. 500 d. 300 e. 600
Specific Heat: A 920-g empty iron kettle is put on a stove. How much heat in joules must it absorb to raise its temperature form 15.0°C to 93.0°C? The specific heat for iron is 113 cal/kg ? C°, and 1 cal = 4.186 J.
A. 33,900 J B. 40,500 J C. 8110 J D. 40,100 J
When a suction cup sticks to a wall it is
A) pulled to the wall by the vacuum. B) pushed to the wall by the atmosphere. C) both of these D) neither of these