A beam of light, traveling in air, strikes a plate of transparent material at an angle of incidence of 56.0°. It is observed that the reflected and refracted beams form an angle of 90.0°. What is the index of refraction of this material?
A) 1.40 B) 1.44 C) 1.43 D) 1.48
D
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From what part of the H-R diagram have the giants in a star cluster evolved?
What will be an ideal response?
The angle of rotation between the ends of a nylon bar is 3.58. The bar diameter is 70 mm and the allowable shear strain is 0.014 rad. The minimum permissible length of the bar is approximately:
(A) 0.15 m
(B) 0.27 m
(C) 0.40 m
(D) 0.55 m
Sending signals at optical wavelengths might be a viable alternative to radio wavelengths
A) only between civilizations around solar-type stars whose eyes have evolved to see such radiation B) over relatively short distances where absorption by interstellar matter would not be a problem C) as long as the light transmitted is a different color than the light given off by the parent star D) over all distances as long as the intensity of the signal is strong enough
Which of the following reaction energies is the most endothermic?
A) 540 kJ/mole B) -540 kJ/mole C) 125 kj/mole D) -125 kJ/mole E) not enough information given