Increasing the mass will,
decrease the frequency of the system
As the Mass is increased, the frequency and hence the pitch decrease. This is quite familiar to most of us. For example, the thick strings on a piano or a guitar produce the lower tones.
Masses in vibrational systems undergoing simple harmonic motion will have a certain time period for their oscillation.
The frequency is the inverse of the time period and is equal to the number of oscillations completed per unit time.
Hence, the greater is the mass, lesser is the frequency and vice versa
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