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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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
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