Why hydrogen atom does not emit X-rays?

a) it has only one electron b) it has narrow energy levels

c) it has far apart energy levels d) it is the lightest patricle.

The elevators in the John Hancock building in Chicago move 522 ft in 44 s. What is their speed? Answer in m/s.

A guitar string is plucked and set into vibration. The vibrating string disturbs the surrounding air, resulting in a sound wave.

What is the voltage of a battery that uses 800J of energy to move 40C of charge through a resistor

Word definition! verb, 9 letters: determine (the amount or number of something) mathematically.

As a result of the violent revolts in france in july 1830

Power=170 watts time=20 seconds

What is the charge of alpha, beta and gamma rays?

A pair of scissors is a complex machine. what simple machines make up a pair of scissors?

Methane gas absorbs red light, and methane clouds reflect blue light, giving Uranus and Neptune their distinctive blue colors. Why do Uranus and Neptune have methane clouds, but Jupiter and Saturn do not

A car traveled 1025 kilometers from El Paso to Dallas in 13.5 hours. What was it's average velocity?