Snell's Law: A beam of light in air enters a glass slab with an index of refraction of 1.40 at an angle of incidence of 30.0°. What is the angle of refraction?
A. 20.9°
B. 47.5°
C. 51.8°
D. 30.0°
E. 14.9°
Answer: A
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In an isochoric process, the internal energy of a system decreases by 50J. What is the work done?
A. zero B. +50 J C. -50 J D. none of the above
Why were scientists surprised when they first discovered the existence of planets with Jupiter-like masses orbiting close to their stars (the "hot Jupiters")?
A) The nebular theory predicts that jovian planets should only form at much larger distances from their stars. B) The surface temperatures of these planets seemed inexplicably high. C) They had expected to detect small, terrestrial planets before large, jovian planets. D) The orbits of these planets did not follow Kepler's laws of planetary motion.
The number of waves passing the observer per second is:
A) the wavelength in angstroms. B) the amplitude in nm. C) the frequency in Hertz. D) the period in seconds. E) the energy in milliwatts.
A proton initially moves left to right along the x axis at a speed of 7.0 × 10^3 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.70 m before coming to rest. What acceleration magnitude does the proton experience?
a. 7.0E+3 m/s2 b. 3.5E+7 m/s2 c. 1.8E+9 m/s2 d. 1.4E+12 m/s2 e. 2.5E+9 m/s2