<span>b. It ensures that measurements are taken from two points
that are very far apart.
Measurements taken six months apart are the farthest apart
that an astronomer can ever get ... they're on opposite sides
of the Earth's orbit !</span>
Answer:
Explanation:
energy of photon having wavelength of 400 nm = 1237.5/400 eV
= 3.1 eV.
Maximum kinetic energy of photoelectrons = 1.1 eV .
Threshold energy Ф = 3.1 - 1.1 = 2 eV .
energy of photons having wavelength of 310 nm = 1237.5 / 310 eV = 4 eV .
Maximum kinetic energy of photoelectrons = energy of photons - Threshold energy
= 4 - 2 = 2 eV .
Required kinetic energy K₀= 2 eV.
Weight = (mass) x (acceleration of gravity).
On Earth, acceleration of gravity = 9.8 m/s² (rounded)
On Earth, 2.2kg of mass weighs (2.2kg) x (9.8 m/s²) =
21.6 kg-m/s² = <em>21.6 Newtons</em>.
(That's about 4.85 pounds.)
Answer:
Part a)

Part b)

Explanation:
Part a)
Equilibrium distance is the distance between two centers when two ions just touch each other
So here we will have


Now Force of attraction between two ions is given by Coulomb's law



Part b)
At equilibrium separation net force between two ions must be zero

so the attraction force and repulsion force must be of equal magnitude
so we have

Your question is asked in a confusing way. Can you share more information about the equation?