Answer:
The initial and final states of the hydrogen atom were n=2 and n=6 respectively.
Explanation:
We must first obtain the energy of the photon;
E= hc/λ
where;
h= Plank's constant = 6.6 * 10^-34 JS
c= speed of light = 3* 10^8 m/s
λ = wavelength of light= 411 nm = 411* 10^-9 m
Substituting values;
E = 6.6 * 10^-34 * 3* 10^8 / 411* 10^-9
E = 4.8 * 10^-19 J or 3.0 eV
But ;
En = 13.6/n^2
So E = En final - En initial
3.0 = -13.6(1/n^2final - 1/n^2initial)
If we substitute n^2final = 6 and n^2 initial = 2 then the RHS becomes approximately equal to the LHS
Therefore the initial and final states of the hydrogen atom were n=2 and n=6 respectively.
This is the correct answer to your question, "BC shows zero acceleration, and CD shows negative acceleration".
An object can be accelerating if it changes direction
Answer: 218,240,000 fathom.
Explanation:
Given : A fathom is a unit of length, usually reserved for measuring the depth of water.
A fathom is approximately 6 ft in length.
The distance from Earth to the Moon to be 248,000 miles.
Since, 1 mile =5280 feet
Then, the distance from Earth to the Moon =
The distance from Earth to the Moon in fathoms :
Hence, the the distance in fathoms 218,240,000 fathom.