Electrons are
a. positively charged c. uncharged
b. negatively charged d. variably charged
B
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Silicon is FCC with an atom at 0,0,0 and an atom at 1/4,1/4,1/4 and a lattice parameter of 0.543 nm.
(a) How many atoms are there in this FCC unit cell? (b) Calculate the number of atoms per unit volume based upon the unit cell. (c) Calculate the number of atoms per unit volume based upon the density of 2.33 × 103 kg/m3.
The Doppler effect refers to changes in a sound wave's
A. amplitude caused by a change in speed of sound. B. amplitude caused by motion of a source or receiver. C. frequency caused by a change in speed of sound. D. frequency caused by motion of a source or receiver.
Prominences are extensions of the solar magnetic fields above sunspots
Indicate whether the statement is true or false
A 120-? laboratory resistor is rated at 0.25 W. What is the safe current through the resistor?
A) 30 A B) 2.1 mA C) 22 mA D) 46 mA