A lamp rated 23W-120V means that it will deliver 23 W
A) when the voltage across it is 120 V.
B) whether or not it is connected to 120 V.
C) as long as the current is ac.
D) none of the above
Answer: A
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In a double-slit experiment, the distance between the slits is 0.2 mm and the distance to the screen is 150 cm. What is the phase difference (in degrees) between the waves from the two slits arriving at a point P when the angular distance of P is 10° relative to the central peak, and the wavelength is 500 nm? (Convert your result so the angle is between 0 and 360°.)
a. 145° b. 155° c. 165° d. 135° e. 95°
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