Each pattern shown below would appear on a screen when monochromatic light of wavelength ? first passes through a narrow slit of width a and then strikes a screen. The darkest areas on the page represent the brightest areas on the screen. In which case does the slit have the greatest width?
a.
b.
c.
e
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A magnifying lens has a focal length of 10 cm. A person has a near point of 25 cm
(a) What is the magnification of the lens for that person when their eyes are focused at infinity? (b) What is the magnification of the lens for that person when their eyes are focused at their near point?
Four unequal resistors connected in series have same current but different voltages
Indicate whether the statement is true or false
A capacitor consists of two large parallel plates of area A separated by a very small distance d. This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q, and then disconnected from the battery
If the separation between the plates is now doubled, the potential difference between the plates will A) double. B) quadruple. C) be cut in half. D) be cut in fourth. E) not change.
An incandescent lightbulb is rated at 100 watts when plugged into a 110 V rms household outlet. Calculate the resistance of the filament and the rms current
a. 12.2 ?, 0.91 A (rms) b. 10 ?, 1.0 A (rms) c. 110 ?, 1.0 A (rms) d. 121 ?, 0.91 A (rms) e. 11 ?, 1.1 A (rms)