Answer:
r=4.55 x 10^-14 m
Explanation:
<u>Identify the unknown: </u>
<em>How close to the gold nucleus could alpha particles come before being deflected? </em>
<u>List the Knowns:
</u>
Charge of alpha particle: Q_1 = 2 x 1.6 x 10^-19 C
Energy of alpha particle: K.E = 4.5 x 10^6 eV = 5 x 10^6 x 1.6 x 10^-19 J
Charge of gold nucleus: Q_2 = 79 x 1.6 x 10^-19 C
Electric force constant: k = 9 x 10^9 N • m^2/c^2
<u>Set Up the Problem: </u>
The alpha particles will be repelled by the gold nucleus and it will approaches until all its kinetic energy transformed into electrical potential energy. so at this distance from the gold nucleus, potential energy equals KE
Potential energy of a two-charge system:
U(r)=k*Q_1*Q_2/r
r=k*Q_1*Q_2/
U
Solve the Problem:
r=4.55 x 10^-14 m
Electromagnetic waves about the size of a golf ball are used for
microwave radio communication and radar every day.
Electromagnetic waves that are about 4-1/2 inches long are used
in the microwave oven to heat leftover meatloaf and make popcorn .
Electromagnetic waves that are 10 times the size of an atom
are hard hard X-rays.
Electromagnetic waves that are the size of Earth's diameter
are used for ELF communications, including standard time
signals, and submarine communication.
Mechanical waves that are the same order of magnitude as
the Earth are seismic (earthquake) waves.
Gamma rays are electromagnetic waves with wavelengths in the
neighborhood of the same size as the atomic nucleus. To get
some idea of their frequency, just contemplate how long it would
take light ... (which can get to the moon in a couple of seconds) ...
to move from one side of an atomic nucleus to the other side.
Answer: The first two weeks after conception are known as the germinal stage.
Explanation:
Answer:
c. Breaking down complex molecules
Acceleration =change in velocity/change in time.
So final speed minus initial velocity/time
3.1-v/2=a
