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
Explain how adaptive optics works
What will be an ideal response?
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