If the wavelength of light in vacuum is 469 nm, what is the wavelength of light in a thin film of index of refraction 1.42?
A) 110 nm
B) 220 nm
C) 330 nm
D) 440 nm
E) 550 nm
C
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Pressure: A 100-kg person sits on a 5-kg bicycle. The total weight is borne equally by the two wheels of the bicycle. The tires are 2.0 cm wide and are inflated to a gauge pressure of 8.0 × 105 Pa. What length of each tire is in contact with the ground?
A. 1.6 cm B. 1.8 cm C. 3.2 cm D. 2.4 cm E. 6.4 cm
Faraday's Law: As shown in the figure, a wire and a 10-? resistor are used to form a circuit in the shape of a square with dimensions 20 cm by 20 cm. A uniform but non-steady magnetic field is directed into the plane of the circuit. The magnitude of the magnetic field is steadily decreased from 2.70 T to 0.90 T in a time interval of 96 ms. What is the induced current in the circuit, and what is its direction through the resistor?
A. 75 mA, from b to a B. 45 mA, from b to a C. 75 mA, from a to b D. 45 mA, from a to b E. 110 mA, from a to b
Roughly what percentage of the mass-energy of in-falling matter can be converted to other forms of energy as the matter falls into a black hole?
A) 0.7% B) 1-4% C) 10-40% D) 100%
Why do we feel type O and B stars are poor candidates for extraterrestrial life?
A) They do not have a habitable Zone. B) They don't produce enough yellow light. C) Their lifetime is too short. D) They don't produce a planetary system. E) Their habitable zone lies too close to the star.