14 Select the correct answer.
Which particles make up the nucleus of an atom?
O A.
protons and electrons
OB.
neutrons and electrons
OC.
protons only
OD.
protons and neutrons
OE.
neutrons only
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Frank just graduated from eighth grade. assuming exactly four years from now he will graduate from high school how many seconds does he have until his high school graduation

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.

Why do atoms emit energy of only specific wavelengths