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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...

Word problem

From a point on a river, two boats are driven in opposite directions, one at 9 miles per hour and the other at 8 miles per hour. In how many hours will they be 68 miles apart?

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