A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half life of the radioisotope is 8 minutes
Indicate whether the statement is true or false
T
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Suppose current is flowing in a wire from right to left. Which way do the electrons in the wire move?
a. right to left b. left to right c. in circles d. It is impossible to tell.
As global warming progresses, the
A) landmasses will warm the most B) equatorial regions will warm the most C) polar regions will warm the most D) oceans will warm the most
Two converging lenses, the first with focal length 10.0 cm and the second with focal length 20.0 cm, are separated by 40.0 cm. An object, 3.00 cm in height, is placed 30.0 cm in front of the first lens. What is the height of the final image?
A. 3.00 cm B. 1.50 cm C. 6.00 cm D. 12.0 cm E. 24.0 cm
A car travels around a curve with constant speed. The correct statement from the following is
A. the car has zero acceleration. B. the car has an acceleration directed in the instantaneous direction of the velocity vector. C. the velocity of the car is constant. D. the car has an acceleration directed inward toward the center of the curve. E. the car has an acceleration directed outward from the center of the curve.