A certain radioactive isotope placed near a Geiger counter registers 160 counts per minute. Eight hours later, the counter registers 10 counts per minute. What is the half-life of the isotope?
A) 8 hours
B) 6 hours
C) 4 hours
D) 2 hours
E) none of the above
Answer: D
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As a block slides down a frictionless incline, which of the following statements is true?
a. Both its speed and acceleration increase. b. Its speed increases and its acceleration remains constant. c. Its speed and acceleration remain constant. d. Its speed increases and its acceleration decreases. Both its speed and acceleration decrease.
A planet is detected via the Doppler technique. The repeating pattern of the stellar motion tells us
A) the planet's size. B) the planet's mass. C) the planet's density. D) the orbital period of the planet. E) the orbital eccentricity of the planet.
We know that any body more dense than water will sink in water. Why?
What will be an ideal response?
In an AC circuit, the ratio of average current to maximum current is:
a. zero. b. 0.5. c. 0.707. d. 1.0.