Light is refracted through a diamond. If the angle of incidence is 30°, and the angle of refraction is 12°, what is the index of refraction?
A. 1.3
B. 2.4
C. 2.6
D. 1.8
E. 0.4
Answer: B
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Uncertainty Principle Using Energy and Time: If the maximum possible accuracy in measuring the lifetime of a particle increases, the maximum possible accuracy in measuring its energy will
A. increase. B. decrease. C. not be affected.
A cool star like Antares would produce more ________ than visible light
Fill in the blank(s) with correct word
Gravitational Force: As a 70-kg person stands at the seashore gazing at the tides (which are caused by the Moon), how large is the gravitational force on that person due to the Moon? The mass of the Moon is 7.35 × 1022 kg, the distance to the Moon is 3.82 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2.
A. 0.24 N B. 0.024 N C. 0.0024 N D. 0.00024 N
Suppose the Hubble constant turned out to be 130 km/sec/Mpc and not 65 km/sec/Mpc. How would that affect our estimate of the age of the Universe?
A. The Universe would be about 7 billion yrs old. B. The Universe would be about 30 billion yrs old. C. It would have no effect on our estimates of the Universe's age. D. The Universe would be about 130 billion yrs old. E. None of these choices is correct.