Light of wavelength 425.0 nm in air falls at normal incidence on an oil film that is 850.0 nm thick. The oil is floating on a water layer 15 cm thick. The refractive index of water is 1.33, and that of the oil is 1.40
You want to add oil so that light reflected off of the top of the oil film will be canceled. What is the minimum distance that you should INCREASE the oil film? A) 60.7 nm
B) 75.9 nm
C) 106 nm
D) 121 nm
E) 152 nm
A
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High temperatures are required to get H nuclei to fuse because they ________ one another because of their ________ electric charges
a. attract; negative b. attract; positive c. repel; negative d. repel; positive
Which type of molecules, vital to our life, were found to have survived a fiery descent to Earth on meteorites?
A) amino acids B) lipids C) DNA D) sugars E) vitamins
A 30-year-old astronaut goes off on a long-term mission in a spacecraft that travels at speeds close to that of light. The mission lasts exactly 20 years as measured on Earth
Biologically speaking, at the end of the mission, the astronaut's age would be A) more than 50 years. B) exactly 50 years. C) less than 50 years. D) exactly 30 years. E) exactly 25 years.
You push horizontally on a 120-N box that is initially resting on a horizontal table. The coefficient of static friction between the box and the table is 0.75, and the coefficient of kinetic friction is 0.40
Find the friction force on the box if the push is equal to (a) 84 N; (b) 94 N.