A beam of light of wavelength 600 nm passes through a slit that is 3.1 × 10-5 m wide, and then goes on to a screen that is 2.2 m from the slit. On the screen, how far is the second dark fringe from the center of the diffraction pattern?
A) 3.9 cm
B) 4.2 cm
C) 6.3 cm
D) 2.1 cm
E) 8.5 cm
E
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The body which wiped out the dinosaurs was about:
A) as big as our Moon. B) as big as one of Mars' moons. C) a few hundred meters across. D) as big as a 747. E) as big as an SUV.
When light in material 1, which is in contact with material 2, undergoes total internal reflection, what condition is necessary for their indices of refraction?
A. n1 = 2 n2 B. n1 > n2 C. n1 < n2 D. n1 = n2 + 1 E. n2 = 1.5
Since the Moon is about 0.5 degrees in angular diameter, about how far does it move in 24 hours across the background of the constellations?
a. 0.5 degrees b. 1.0 degree c. 2 degrees d. 9 degrees e. 13 degrees
Arcturus, the brightest star of spring skies, is spectral type K, so to us it appears ________ in color
Fill in the blank(s) with correct word