A light ray in air enters and passes through a block of glass. What can be stated with regard to its speed after it emerges from the block?
a. Speed is less than when in glass.
b. Speed is same as that before it entered glass.
c. Speed is same as that in glass.
d. Speed is less than before it entered glass.
B
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A blue shift for light indicates that the light source is moving
A) toward you. B) away from you. C) both of these D) neither of these
Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed for a satellite about Jupiter would be
A) less than 8 km/s. B) greater than 8 km/s. C) about 8 km/s.
Energy Levels: The wavelength of a ruby laser is 694.3 nm. What is the energy difference between the two energy states for the transition that produces this light? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 1.54 eV B. 1.65 eV C. 1.79 eV D. 1.81 eV
You are in an airplane, traveling relative to the ground at 500 km/hr. You throw a baseball toward the front of the plane at a speed of 50 km/hr. How fast would someone on the ground say the baseball is moving?
A) 550 km/hr B) 50 km/hr C) 500 km/hr D) 450 km/hr.