Answer:
A=emitted B=absorbed
Explanation:
If an electron drops down from n=2 to n=1 energy is emitted, and if the electron moves up from n=1 to n=2 energy is absorbed. The amount of energy that is either absorbed or emitted is called quanta.
During the transition of an electron from n = 2 to n = 1 energy will be emitted.
During the transition of an electron from n = 2 to n = 4 energy will be absorbed.
Given:
The electronic transitions in a hydrogen atom to the Bohr atom:
a. n = 2 to n = 1
b. n = 2 to n = 4
To find:
Whether the energy is emitted or absorbed during the given transitions of an electron in a hydrogen atom.
Solution:
a. n = 2 to n = 1
When an electron jumps from a higher energy level to a lower energy level the energy is emitted by an electron in the form of an electromagnetic wave.
So, during the transition of an electron from n = 2 to n = 1 energy will be emitted.
b. n = 2 to n = 4
When an electron jumps from a lower energy level to a higher energy level it is due to the energy absorbed by an electron.
So, during the transition of an electron from n = 2 to n = 4 energy will be absorbed.
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