Explanation:
(a) It is known that relation between energy and mass is as follows.
where, E = energy
m = mass
c = speed of light = 
m/s
As it is given that mass is 
kg. So, putting the given values into the above formula as follows.
= 
= 
Therefore, we can conclude that the energy produced by the reaction between one electron and one positron is .
(b) When gamma ray photons are produced then they will have the same frequency. Relation between energy and frequency is as follows.
E = 
..... (1)
where, h = plank's constant = 
= frequency
Also, ........ (2)
Hence, equating equations (1) and (2) as follows.
= 
So,
=
= 
Thus, we can conclude that the frequency is .
Answer:
Explanation:3.2 ft 2 fti2 ft 4 ft ft2
Answer:
The correct answer is option A.
Explanation:
Stars are bundles of hot gases which primarily consists of hydrogen gas and then helium. Their shine is due to thermonuclear fusion of hydrogen into helium or burning of hydrogen gas into helium in their cores which releases large amount of energy and later this process leads to formation of some heavier elements.
In the following reaction,76.616 litre of oxygen will react
Since HClO4 is a strong acid it will completely dissociate in solution.
HClO4 + H2O --> H3O+ + ClO4-
Therefore, your concentration of HClO4 will be equal to your amount of H3O+, the conjugate acid in solution.
The Ka expression is as follows:
Ka= [H3O+][ClO4-] / [HClO4]
So you know that -log [H3O+] gets you pH, so just plug in [2.2] as your concentration of H3O+ and your answer should be -.34 pH
