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help with atom and atomic

1.  when the electrons of an atom absorb energy   a.  they move further from the nucleus b.  they increase their potential energy c.  their quantum number...

help with light

1.  when light falls on a surface which irregular compared to its wavelength   a.  the reflection is diffuse b.  glare is produced c.  the wavelength is refracted d...

What is the speed?

The speed of a stream is 5 mph. If a boat travels 46 miles downstream in the same time that it takes to travel 23 miles upstream, what is the speed of the boat in still water?

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