A centrifuge rotates at 100 rev/s (i.e., 628 rad/s). If the test tube places the suspension at 10 cm from the axis of rotation, by what factor are the terminal speeds of the settling particles increased as compared to sedimentation cause by gravity?
a. 3.2 × 10^3
c. 800
b. 64
d. 4.0 × 10^4
D
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A proton and an electron are placed in an electric field. Which undergoes the greater acceleration?
A) electron B) proton C) both accelerate equally. D) none of the above
An extrinsic n-type semiconductor can be made from Group IV germanium by adding impurity atoms of:
(a) Group IV silicon (b) Group III aluminum (c) Gorup II magnesium (d) Group V arsenic
Significant Figures: In the sum A + B + C, A is accurate to 5 decimal places, B is accurate to 2 decimal places, and C is accurate to 3 decimal places. What is the correct number of decimal places in the sum?
A. 2 B. 3 C. 4 D. 5 E. 10
Which of the following statements about electromagnetic waves in free space are true?
A. The higher-frequency travel faster than the lower-frequency waves. B. The higher-frequency waves have shorter wavelengths than the lower-frequency waves. C. The wavelengths of the visible waves are some of the longest electromagnetic waves. D. The wavelengths of the visible waves are some of the shortest electromagnetic waves. E. The electric field vector is always at right angles to the magnetic field vector.