In a He-Ne laser, the actual emission line at 632.8 nm comes from a jump down in what atom(s)?
A) neon
B) helium
C) helium and neon
D) oxygen
E) hydrogen
A
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All charged rods have the same length and the same linear charge density (+ or -). Light rods are positively charged, and dark rods are negatively charged. For which arrangement below would the magnitude of the electric field at the origin be largest?
Planetary orbits are circles
a. True b. False Indicate whether the statement is true or false
The vertical speed of a projectile
a. is zero. b. stays constant. c. continuously increases. d. continuously decreases. e. sometimes decreases and sometimes increases.
During a basketball game, a player shoots a ball from half-court. When the ball reaches a height of 4.5 m above the floor, it is moving at 5.0 m/s. Assuming the shot was perfectly made, it will pass through the rim of the basket, 3.05 m above the floor. How fast the ball moving when it passes through the rim?
A. 7.7 m/s B. 7.3 m/s C. 9.2 m/s D. 5.3 m/s