Calculate the half-value thickness (in mm) of lead if it reduces the intensity of a beam of x-rays whose wavelength is 10 pm by a factor of two. (Assume the linear absorption coefficient of lead is 43 cm?1 for x-rays of wavelength 10 × 10^?12 m.)
a. 0.24
b. 0.20
c. 0.12
d. 0.16
e. 0.18
d
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A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?
a. ?0.21 kJ b. ?0.47 kJ c. ?0.40 kJ d. ?0.34 kJ e. ?0.69 kJ
A light bulb is rated at 30 W when operated at 120 V. How much charge enters (and leaves) the light bulb in 1.0 min?
a. 17 C b. 15 C c. 14 C d. 13 C e. 60 C
A student releases a ball from rest on an inclined plane and measures that it travels a distance of 0.8 m in a time of 4.0 s. The average speed of the ball is
A. 1.0 m/s. B. 3.2 m/s. C. 0.2 m/s. D. 2.0 m/s.