# Define frequency time period and amplitude relationship

### Amplitude, time-period and frequency of vibration | Class 8, Sound

Read and learn for free about the following article: Oscillation amplitude and period. Period is the amount of time it takes for one cycle, but what is time in our It's also worth mentioning the term frequency: the number of cycles per time unit. Frequency is the number of occurrences of a repeating event per unit of time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency. The period is the duration of time of one cycle in a repeating event, so the Angular frequency, usually denoted by the Greek letter ω (omega), is defined. Energy of Waves: Amplitude, Frequency & Energy Loss. Wave Period: How Sound Waves Interact: Definitions & Examples. What is Amplitude? . The period is the time it takes a wave to complete one cycle. We measure the This equation represents the relationship between frequency and period.

But the act of continually vibrating the first coil with a back-and-forth motion in periodic fashion introduces a wave into the slinky. Suppose that a hand holding the first coil of a slinky is moved back-and-forth two complete cycles in one second. The frequency of a wave refers to how often the particles of the medium vibrate when a wave passes through the medium.

Frequency is a part of our common, everyday language. For example, it is not uncommon to hear a question like "How frequently do you mow the lawn during the summer months? If a coil of slinky makes 2 vibrational cycles in one second, then the frequency is 2 Hz. If a coil of slinky makes 3 vibrational cycles in one second, then the frequency is 3 Hz. The quantity frequency is often confused with the quantity period.

Period refers to the time that it takes to do something. When an event occurs repeatedly, then we say that the event is periodic and refer to the time for the event to repeat itself as the period. The period of a wave is the time for a particle on a medium to make one complete vibrational cycle. Period, being a time, is measured in units of time such as seconds, hours, days or years.

## Frequency and Period of a Wave

The period of orbit for the Earth around the Sun is approximately days; it takes days for the Earth to complete a cycle. The period of a typical class at a high school might be 55 minutes; every 55 minutes a class cycle begins 50 minutes for class and 5 minutes for passing time means that a class begins every 55 minutes. The period for the minute hand on a clock is seconds 60 minutes ; it takes the minute hand seconds to complete one cycle around the clock.

Frequency and period are distinctly different, yet related, quantities. Frequency refers to how often something happens.

Period refers to the time it takes something to happen. Frequency is a rate quantity.

• Oscillation amplitude and period
• Period (physics)
• Amplitude, time-period and frequency of vibration

Period is a time quantity. As an example of the distinction and the relatedness of frequency and period, consider a woodpecker that drums upon a tree at a periodic rate. If the woodpecker drums upon a tree 2 times in one second, then the frequency is 2 Hz. Each drum must endure for one-half a second, so the period is 0.

### Period (physics) - Simple English Wikipedia, the free encyclopedia

The strobe light is pointed at the rotating object and the frequency adjusted up and down. When the frequency of the strobe equals the frequency of the rotating or vibrating object, the object completes one cycle of oscillation and returns to its original position between the flashes of light, so when illuminated by the strobe the object appears stationary. Then the frequency can be read from the calibrated readout on the stroboscope.

A downside of this method is that an object rotating at an integral multiple of the strobing frequency will also appear stationary. Frequency counter Modern frequency counter Higher frequencies are usually measured with a frequency counter. This is an electronic instrument which measures the frequency of an applied repetitive electronic signal and displays the result in hertz on a digital display. It uses digital logic to count the number of cycles during a time interval established by a precision quartz time base.

Cyclic processes that are not electrical in nature, such as the rotation rate of a shaft, mechanical vibrations, or sound wavescan be converted to a repetitive electronic signal by transducers and the signal applied to a frequency counter. This represents the limit of direct counting methods; frequencies above this must be measured by indirect methods.

Heterodyne methods[ edit ] Above the range of frequency counters, frequencies of electromagnetic signals are often measured indirectly by means of heterodyning frequency conversion.

A reference signal of a known frequency near the unknown frequency is mixed with the unknown frequency in a nonlinear mixing device such as a diode.