Constructive interference of two coherent waves will occur if the path difference is
A) 3/4 ?.
B) 6/2 ?.
C) 3/2 ?.
D) 1/4 ?.
E) 6/4 ?.
B
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If you are standing at the Earth's North Pole, which of the following would be located at the zenith?
a. The nadir b. The star Vega c. The celestial equator d. The north celestial pole
Algol consist of a 3.7 MSun main-sequence star and a 0.8 MSun subgiant. Why does this seem surprising, at least at first?
A) The two stars should be the same age, so we'd expect the subgiant to be more massive than the main-sequence star. B) The two stars in a binary system should both be at the same stage of life; that is, they should either both be main-sequence stars or both be subgiants. C) It doesn't make sense to find a subgiant in a binary star system. D) A star with a mass of 3.7 MSun is too big to be a main-sequence star.
Magnifying Glass With the Image at the Near Point of the Eye: The angular magnification of a magnifying glass is largest when the image is at
A. the far point of the eye. B. the focal point of the lens. C. the near point of the eye. D. infinity. E. The magnification depends on the magnifying glass lens, not where the person puts his eye.
How do regions showing strong radio emission from molecules look in the infrared-light image? Are they bright or are they dark?
What will be an ideal response?