How many photons per second emerge from a laser of power 2.00 mW with wavelength 605 nm? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A) 6.09 × 1015 photons/s
B) 5.03 × 1012 photons/s
C) 3.07 × 1015 photons/s
D) 3.07 × 1013 photons/s
A
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What part of a cell stores the coded information?
a. cell membrane b. cell wall c. cytoplasm d. ribosome e. nucleus
A 6.0-?F capacitor is connected in series with a 5.0 M? resistor, and this combination is connected across an ideal 15-V DC battery. What is the current in the circuit when the capacitor has reached 20% of its maximum charge?
A) 6.5 ?A B) 2.4 ?A C) 1.3 ?A D) 4.7 ?A E) 9.1 ?A
An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, then the magnetic field must have a component
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A long, thin rod of uniform cross section and length L has a density that depends on position along the bar. The linear density of the rod is given as A(1 - x/L) + B, where L is the distance from the left end of the rod
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