Which of these will penetrate into lead?
A) alpha particle
B) beta particle
C) gamma ray.
D) all of the above
Answer: C
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Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the Sun, respectively. The ratio of the gravitational force exerted by the Sun on sphere 1 to the pressure of solar radiation on sphere 1 is T1; the ratio for sphere 2 is T2. The ratio of T2 to T1 is
A. 0.25. B. 0.50. C. 1.0. D. 2.0. E. 4.0.
What is the net power radiated by a little animal with a surface area of 0.075 m2 if his emissivity is 0.75, his skin temperature is 315 K, and he is in a room with a temperature of 290 K? (? = 5.67 × 10-8 W/m2 ? K4)
A) 8.8 W B) 6.0 W C) 8.0 W D) 15 W E) 18 W
An air bubble underwater has the same pressure as that of the water. As the air bubble rises toward the surface (and its temperature remains constant), the volume of the air bubble
A) increases. B) decreases. C) remains constant. D) increases or decreases, depending on the rate it rises.