An electromagnetic wave is propagating towards the west in free space. At a certain moment the direction of the magnetic field vector associated with this wave points vertically upward. What is the direction of the electric field vector?
A) horizontal and pointing south
B) vertical and pointing down
C) horizontal and pointing north
D) vertical and pointing upward
E) horizontal and pointing east
A
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Which spacecraft was the first to photograph Uranus in 1986?
a. Hubble Space Telescope b. Cassini-Huygens c. Cassini-Huygens d. Voyager 2 e. New Horizons
Thin Lenses: A 14-mm tall postage stamp is 4.0 mm from a converging lens. If the image of the stamp is 4.0 mm tall, how far is it from the lens?
A. 14 mm B. 8.7 mm C. 1.4 mm D. 1.1 mm
The distance between peaks on a wave divided by the time for the wave to travel this distance is the wave's
a. speed. b. frequency. c. wavelength. d. amplitude. e. loudness.
Light from a monochromatic source shines through a double slit onto a screen 5.00 m away. The slits are 0.180 mm apart. The dark bands on the screen are measured to be 1.70 cm apart. What is the wavelength of the incident light?
A) 457 nm B) 306 nm C) 392 nm D) 612 nm E) 784 nm