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Say you are asked to calculate the frequency of a photon emitted by a hydrogen atom after making a transition from a higher energy level to a lower energy level. Well when using the Rydberg equation you would get a negative energy because energy is being emitted. But my question is could you get a negative frequency when dividing that negative answer you found using the Rydberg equation by planck's constant, or should frequency always be positive?
The negative sign may be ignored, because negative and positive signs are used only to convey the idea of losing/gaining energy, but not for the actual calculation. A negative simply indicates energy is lost and positive that energy is gained. However, what matters is the actual amount of energy in terms of calculations. We cannot have a negative frequency, because frequency in the number of waves over a given amount of time. We can't have a negative number of waves passing through a specific amount of time.
Frequency measures the number of times a wave passes through a given point in a given amount of time. Given that fact, frequency cannot be negative as you cannot have a negative number of waves. If you are getting a negative frequency, you can check and see if maybe there are negative on both sides of the equation that should cancel out.
In terms of frequency, a negative value cannot be obtained because it is the number of waves over a given unit of time. Negative values represent the loss or gain of energy in terms of a change in energy under the Bohr frequency condition.
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