Total Internal Reflection: A light beam with wavelength 440 nm in a certain material then enters air and its wavelength becomes 577 nm.(a) What is the index of refraction for the material?(b) At what angle with the plane of the surface will the light be totally reflected back into the material?
Fill in the blank(s) with the appropriate word(s).
(a) 1.31 (b) 40.3°
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In modern Miller—Urey experiments it is assumed that carbon and nitrogen in the early atmosphere were present as
A) methane (CH4 ) and ammonia (NH3) B) carbon dioxide (CO2 ) and nitrogen (N2) C) carbonates (CO3-) and nitrates (NO3-) D) carbon and nitrogen atoms
The following four forces act on a 4.00 kg object:
F1 = 300 N east F2 = 700 N north F3 = 500 N west F4 = 600 N south What is the acceleration of the object? A) 224 N in a direction 63.4° north of west B) 300 N in a direction 63.4° north of west C) 300 N in a direction 26.6° north of west D) 224 N in a direction 26.6° north of west E) 2100 N in a direction 26.6° north of west
Why do some igneous rocks have large crystals?
What will be an ideal response?
Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the acceleration 
of the first person to the acceleration 
of the second person. Which statement is correct?
A.
B.
C.
is greater than , but they have the same direction.D.
is greater than , but they have opposite directions.E.
is less than , but they have the same direction.