Loops of glowing hydrogen seen hanging over the solar limb during totality are:
A) solar rainbows.
B) haloes.
C) prominences.
D) filaments.
E) flares.
C
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The average density of each planet in the solar system is determined by taking its mass and dividing that by its
A) radius. B) diameter. C) surface area. D) radius squared. E) volume.
In the double-slit experiment with electrons, suppose that the observer uses a detector to determine through which slit the electron actually passes. Does this affect the outcome of the experiment, and why or why not?
A) No, the pattern on the screen remains an interference pattern, regardless of the detector. B) No, the pattern on the screen remains a non-interference pattern, regardless of the detector. C) Yes, the detector causes the pattern on the screen to suddenly change from an interference pattern [with no detector] to two tiny spots directly behind each slit [with the detector]. D) Yes, the detector causes the pattern on the screen to suddenly change from an interference pattern [with no detector] to a non-interference pattern [with the detector]. E) Yes, the detector causes the pattern on the screen to suddenly change from a non-interference pattern [with no detector] to an interference pattern [with the detector].
Laser light sent through a double slit produces an interference pattern on a screen 3.00 m from the slits. If the eighth-order maximum occurs at an angle of 63.4°, at what angle does the third-order maximum occur?
a. No third-order maximum occurs. b. 0.34° c. 19.6° d. 23.8° e. Not enough information is given.
A flat coil having 40 turns, each one of cross-sectional area 12.0 cm2, is oriented with its plane perpendicular to a uniform magnetic field. The field varies steadily from 0.00 T to 1.20 T in 20.0 ms
What emf is induced in the coil during this time?