The shortest-daylight day for people in the Northern Hemisphere at latitudes greater than 30°N occurs at the
a. summer solstice.
b. vernal equinox.
c. winter solstice.
d. autumnal equinox.
c
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__________is a possible form of dark energy that can change in strength as the Universe ages
A) Microwave B) Quintessence C) Isotope D) Redshift
A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV. What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J • s, 1 eV = 1.60 × 10-19 J)
A) 6.8 × 1014 Hz B) 2.7 × 1014 Hz C) 7.6 × 1014 Hz D) 8.5 × 1014 Hz E) 9.4 × 1014 Hz
The vertical displacement of a string is given by y(x,t) = (6.00 mm) cos[(3.25 m-1)x - (7.22 s-1)t]. What is the speed of the wave?
A) 0.450 m/s B) 1.41 m/s C) 2.22 m/s D) 3.16 m/s E) 23.5 m/s
Explain how adaptive optics works
What will be an ideal response?