An ionized atom having Z protons has had all but one of its electrons removed. If R is the radius of the ground state electron orbit in atomic hydrogen, then what is the radius of the shell of the remaining electron in the ionized atom?
A) R B) R/Z2 C) ZR D) Z2R E) R/Z
E
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If each frame of a motion picture film is 35 cm high, and 24 frames go by in a second, estimate how many frames are needed to show a two hour long movie
a. 1400 b. 25000 c. 50000 d. 170000 e. This cannot be determined without knowing how many reels were used.
Index of Refraction: The index of refraction of a certain glass is measured to be 1.5. What is the speed of light in that glass? (c = 3.0 × 108 m/s)
A. 1.0 × 108 m/s B. 2.0 × 108 m/s C. 3.0 × 108 m/s D. 4.0 × 108 m/s E. 5.0 × 108 m/s
The potential energy for the formation of a hydrogen molecule can be approximated by U = -A + BR + C/R, where R is the nuclear separation. Given that A = -78.5 eV, B = 2.57 × 1011 eV/m , and C = 1.44 × 10-9 eV?m
At what nuclear separation is the potential energy a minimum? A) 1.9 × 10-11 m B) 3.7 × 10-10 m C) 7.5 × 10-11 m D) 2.9 × 10-11 m E) 5.1 × 10-10 m
A vertical side of a cooling tower is approximately 90ºC when the surrounding air is 25ºC. If the tower is 30 m high, estimate the maximum vertical velocity of the air due to natural convection.
What will be an ideal response?