How many times greater is the speed of red light (? = 700 nm) than the speed of violet light (? = 400 nm) in a vacuum?
Both have the same speed, c.
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Liquid mercury is contained in a lead beaker as shown in Figure 1-14. Estimate the amount of mercury that migrates by diffusion into the beaker after 48 hours if the concentration of mercury is 2% at a distance 0.01 cm into the beaker wall from the inside surface. Assume that the system is at 20ºC and neglect evaporation to air.
Series/Parallel Circuits: Draw a circuit consisting of a battery connected to two resistors, R1 and R2, in series with each other and a capacitor C connected across the resistors.
A. 
B. 
C. 
D. 
Three couples of equal magnitude (M0 5 100 N?m) are applied as shown. A single couple (in N?m) that is statically equivalent to the three couples is:
(A) 83.2i 2 89.4j
(B) 283.2i 1 89.4j
(C) 93.2i 1 79.4j
(D) 83.2i 1 89.4j
The 1920s represents the dawn of commercial radio. How would those investors interested in the new technology decided what growth possibilities there were? Would knowledgeable investors have drawn straight lines on regular or on semilogarithmic
graph paper? Why?