Sunspots are known to be magnetic phenomena because
a. Doppler shifts in spectral lines are observed.
b. the Zeeman effect is observed in sunspots.
c. collisional broadening is observed in spectral lines.
d. infrared observations indicate that the sunspots are cooler than their surroundings.
e. observations during eclipses reveal a very extensive photosphere.
B
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Other astronomers were skeptical about Percival Lowell's claims of Martian canals because
A) it did not seem possible for his telescope to see the surface through its thick atmosphere B) they discovered that Lowell suffered from poor vision C) they were able to prove that Lowell's telescope was faulty D) when they pointed their own telescopes toward Mars they couldn't see them
A uniform film of oil (n = 1.31) is floating on water. When sunlight in air is incident normally on the film, an observer finds that the reflected light has a brightness maximum at ? = 450 nm and a brightness minimum at ? = 600 nm. What is the thickness of the oil film?
What will be an ideal response?
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion. The net force points downward
a. True b. False Indicate whether the statement is true or false
Force on a Moving Charge: After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations:Electrons moving upward feel a magnetic force in the northwest direction.Electrons moving horizontally toward the north are pushed downward.Electrons moving horizontally toward the southeast are pushed upward.Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction?
A. toward the east B. toward the northeast C. toward the southwest D. toward the southeast E. toward the west