A jet flies at 1.4 times the speed of sound. What is the half-angle of the conical shock wave formed?
A) 46° B) 44° C) 30° D) 36°
A
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A filtergram is a photograph of the Sun's surface made
a. in a band of wavelengths in the infrared. b. in a band of wavelengths in the ultraviolet. c. using the Zeeman effect. d. with only those photons emitted in a specific spectral line. e. none of the others.
Magnetic Field of a Long Wire: Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions. The wire on your right carries current directly toward you, and the wire on your left carries current directly away from you. From your point of view, the magnetic field at a point exactly midway between the two wires
A. points upward. B. points downward. C. points toward you. D. points away from you. E. is zero.
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
Given that 
and 
, what is 
? ?
A.
B.
C.
D.
E.
Which of the following quantities are "quantized?"
1. The potential energy at each rung of a ladder. 2. The potential energy along the length of a slide. 3. Wavelength of a standing wave on a string. 4. The settings on an analog radio dial. 5. The settings on a digital radio dial. A. 1 and 3 B. 2 and 4 C. 1, 3, and 4 D. 1, 3, and 5