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

Physics & Space Science

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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

Physics & Space Science

Planetary orbits are circles

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

The vertical speed of a projectile

a. is zero. b. stays constant. c. continuously increases. d. continuously decreases. e. sometimes decreases and sometimes increases.

Physics & Space Science

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?

Physics & Space Science