Questions - period of vibration
Question
A tuning fork has a frequency of 440 Hz.
- What does a frequency of 440 Hz mean?
- Calculate the period of vibration.
- A frequency of 440 Hz means that the prongs of the tuning fork vibrate 440 times every second.
- \(\text{period T =}~\frac{\text{1}}{\text{f}}\)
\(\text{period T =}~\frac{\text{1}}{\text{440 Hz}}\)
T = 0.0023 s = 2.3 x 10-3 s or 2.3 ms.
The period of vibration is 0.0023 s.
Key point
There are three equations for calculating frequency:
- \(\text{frequency f =}~\frac{\text{number of waves to pass a point}}{\text{time taken in seconds}}\)
- \(\text{f =}~\frac{\text{v}}{\text{位}}\)
- \(\text{f =}~\frac{\text{1}}{\text{T}}\)
Use the information given in the question to select the appropriate equation to use.