D = m/ V
8.9 = 3 / V
V = 3 / 8.9
V = 0.3 cm³
Answer A
hope this helps!
Every plant cell has a nucleus because a nucleus controls the cell's main <span>activities.</span>
Answer:
Kinetic energy of electron = -E₂ = 3.4 ev
Kinetic energy of electron = -E₄ = 0.85 ev
Explanation:
In case of hydrogen atom energy associated with nth state is,
En = -13.6/n²
For n = 2
E₂ = -13.6 / 2²
E₂ = -13.6/4
E₂ = -3.4 ev
Kinetic energy of electron = -E₂ = 3.4 ev
For n = 4
E₄ = -13.6 / 4²
E₄ = -13.6/16
E₄ = -0.85 ev
Kinetic energy of electron = -E₄ = 0.85 ev
Fe (iron) has 26
protons,30 neutrons and 26 electrons. In order to calculate the binding energy,
first you need to find the total mass of all particles in the nucleus:
<span>
<span>26 x mass of proton + 30 x mass of neutron ( all in a.m.u.) =
say "m" </span></span>
<span>
Mass defect is m- 55.9207 amu, then convert it into grams and
put in equation E = mc2 to get binding energy of Fe.</span>
<span> Divide it by number of nucleons to get binding
energy per nucleon</span>.
