Answer:
binding energy is 99771 J/mol
Exlanation:
given data
threshold frequency = 2.50 × Hz
solution
we get here binding energy using threshold frequency of the metal that is express as
..................1
here E is the energy of electron per atom and h is plank constant i.e. and x is binding energy
and here N is the Avogadro constant =
so E will
E =
so put value in equation 1 we get
= 2.50 × ×
solve it we get
x = 99770.99
so binding energy is 99771 J/mol
Answer:
J
Explanation:
Parameters given:
We know that the electron fell from level 4 to level 1. We can use the Rydberg's equation to find the that is emitted by the electron in the process. Rydberg's equation is given as:
1/λ =
where R = Rydberg's constant =
1/λ =
1/λ =
1/λ =
1/λ =
∴ λ = m
Energy of the photon is given by:
E = (hc)/λ
where
h = Planck's constant =
c = speed of light = 299792458 m / s
∴ E =
E = J
The energy of the photon is J
After one half-life, 8 g of radioactive isotope will remain in the sample.
<h3>What is radioactivity?</h3>
The act of producing radiation spontaneously is known as radioactivity. This is accomplished by an unstable atomic nucleus that want to give up some energy in order to move to a more stable form.
The following formula is used to compute the number of half lives elapsed:
Hence,8 gram of radioactive isotope remains in the sample after 1 half-life.
To learn more about the radioactivity, refer to the link;
brainly.com/question/1770619
#SPJ1