Energy is the capacity for doing work.
Answer:
1. A
sound can't travel through vacuum only
The energy-level change occurs as the atom is absorbs a 2.03-eV photon.
<h3>
Energy change of the mercury atom</h3>
The energy change of the mercury atom is calculated as follows;
Energy emitted by a photon when it falls from level b to energy level e is calculated as follows;
ΔE = -3.71 eV - (-5.74 eV)
ΔE = -3.71 eV + 5.74 eV
ΔE = 2.03 eV
When electron jumps from lower energy level to higher energy level, energy is absorbed, thus, the energy-level change occurs as the atom is absorbs a 2.03-eV photon.
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