In an SEM, the crystallographic orientation of the surface is determined by the diffraction of
(a) Secondary electrons
(b) Emitted x-rays
(c) Backscattered electrons
(d) The primary electron beam
(c) Backscattered electrons
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Angular Momentum: A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg ? m2. If he pulls in his arms so his moment of inertia decreases to 1.80 kg ? m2, what will be his new angular speed?
A. 2.25 rad/s B. 4.60 rad/s C. 6.25 rad/s D. 0.81 rad/s
A 10-cm focal length converging lens is used to magnify small newspaper print 2.0 mm high. Calculate the height of the image (in mm) for the maximum magnification for a normal eye.
A. 3.5 B. 7.0 C. 9.2 D. 12 E. 2.5
An alpha particle (mass = 6.68 × 10^?27 kg) is emitted from a radioactive nucleus with a kinetic energy of 4.55 MeV. How fast is the alpha particle moving in m/s? (1 MeV = 1.6 × 10^?13 J)
a. 3.84E+3 m/s b. 1.48E+7 m/s c. 1.04E+7 m/s d. 3.82E+7 m/s e. 5.11E+6 m/s
In a liquid, a current is set up between points A and B. Positive ions are going from A to B moving 6.0 coulombs of positive charge per second and negative charges are moving from B to A moving 2.0 coulombs of negative charge per second. What is the current from A to B?
A. 8.0 A B. -8.0 A C. 4.0 A D. -4.0 A E. 12 A