If the phase angle between sound waves from two different point sources is 180°, what kind of interference will occur?
A) destructive
B) constructive
C) either constructive or destructive
A
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Compared to today, in the future, the Sun's habitable zone will be
A) wider and closer to the Sun B) narrower and closer to the Sun C) narrower and farther from the Sun D) wider and farther from the Sun
How do microwave ovens can heat food more quickly than conventional ovens?
a. Microwaves give energy directly to the molecules in the food. b. Conventional ovens must conduct heat from the surface to the interior of the food. c. Microwaves heat the inside as well as the surface of the food. d. all of the above
In a double-slit experiment, the distance between the slits is 0.2 mm and the distance to the screen is 100 cm. What is the phase difference (in degrees) between the waves from the two slits arriving at a point 5 mm from the central maximum when the wavelength is 400 nm? (Convert your result so the angle is between 0 and 360°.)
a. 90° b. 180° c. 270° d. 360° e. 160°
Ohm's Law: The graph shown in the figure shows the results of measurements of the dc current through a circuit device for various potential differences across it. Assume that all the numbers shown are accurate to two significant figures. What is the resistance of this device?
Fill in the blank(s) with the appropriate word(s).