Difference between revisions of "Frequency"
(→Equation) |
|||
| Line 18: | Line 18: | ||
===Equation=== | ===Equation=== | ||
| + | Frequency = 1/(Period) | ||
| + | |||
<math>f = \frac{1}{T}</math> | <math>f = \frac{1}{T}</math> | ||
| + | |||
Where: | Where: | ||
| − | + | ||
| − | + | f = [[Frequency]] | |
| + | |||
| + | T = [[Period|time period]] (the [[time]] it takes for one [[wave]] to pass a point). | ||
==Key Stage 4== | ==Key Stage 4== | ||
Revision as of 13:18, 18 February 2019
Contents
Key Stage 3
Meaning
Frequency is the number of waves that pass by in one second.
About Frequency
| Water Waves |
 |
| The frequency of this wave can be found by counting the number of times the red marker oscillates every second. |
- The higher the frequency the quicker the wave oscillates.
- In sound frequency is known as pitch. A high pitch is a high frequency.
- In light frequency affects the colour of the light. Red is a low frequency and violet is a high frequency.
Equation
Frequency = 1/(Period)
\(f = \frac{1}{T}\)
Where:
f = Frequency
T = time period (the time it takes for one wave to pass a point).
Key Stage 4
Meaning
Frequency is the number of waves that pass a given point in one second.
About Frequency
| Water Waves |
|
| The frequency of this wave can be found by counting the number of times the red marker oscillates every second. |
- The higher the frequency the quicker the wave oscillates.
- In sound frequency is known as pitch. A high pitch is a high frequency.
- In light frequency affects the colour of the light. Red is a low frequency and violet is a high frequency.
- Frequency can be found by counting the number of waves which pass a point in a given time and dividing this by the time.
Equation
NB: You do not need to remember these equations but you should know how to find frequency given the number of waves passing a point and the time taken.
Equation 1
Frequency = 1/(Period)
\(f = \frac{1}{T}\)
Where: f = Frequency
T = time period (the time it takes for a wave to pass a point).
Equation 2
Frequency = (Number of Waves which pass a point)/(Time taken for waves to pass a point)
\(f = \frac{n}{t}\)
Where: f = Frequency
n = Number of waves which pass a point.
t = The time taken for those waves to pass a point.
Example Calculations
| A scientist wants to determine the frequency of a pendulum. They count that the pendulum oscillates 15 times over 20 seconds. Calculate the frequency of the pendulum. | A sailor notices a buoy bounce up and down 24 times over a minute. Calculate the frequency of the waves. |
| 1. State the known quantities
n = 15 t = 20s |
1. State the known quantities
n = 24 t = 60 |
| 2. Substitute the numbers into the equation and solve.
\(f = \frac{n}{t}\) \(f = \frac{15}{20}\) \(f = 0.75Hz\) |
2. Substitute the numbers into the equation and solve.
\(f = \frac{n}{t}\) \(f = \frac{24}{60}\) \(f = 0.4Hz\) |