# BTEC Unit 1 Physics

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BTEC SCIENCE UNIT 1 REVISION: PHYSICS:

Define wave:

It is able to pass energy from each surrounding of it, as a recurring event.

Define periodic time:

It is the motion that repeats itself regularly which is called the periodic motion. One completed repetiton of the motion can be classified as a cycle. The duration of each cycle is the period where the frequency refers to the number of cycles that have been completed in the interval of time.

Define wavelength:

It is the measurement of a distance between two identical peaks (high points) or troughs (low points) in a wave, a repeating pattern of travelling energy like light or sound that has been shown.

Define frequency:

The frequency is shown as the number of cycles per second in an alternating current of direction. The standard unit of frequency can be shown as in hertz.

Define amplitude:

It is the maximum displacement of points on a wave where the degree of intensity that has been changed.

Define oscillation:

This can be shown as the periodic motion that repeats itself in a regular cycle. An oscillating movement  being formed around an equilbrium point or a mean value.

Define transmission:

It can be shown as waves passing through and object.

Define stationary waves:

They are defined as a result of the superposition of two waves with the same amplitude and frequency, travelling at the same speed, but in opposite directions.

Diffraction Gratings:

A diffraction grating can be defined as a flat plane object that has a series of regular lines which have been formed on the block parts of an advancing wave - front.

What is superposition?

This ca be defined as waves being added together when being shown in separate sources that have been overlapped at a given location in space.

What is path difference?

It is defined as the difference in length between two straight lines from a particular grating to a given point in space from the next grating gap.

What is the term coherent?

This can be defined as the waves have a constant phase difference and the same frequency, and the same waveform.

What are interference patterns?

Wave interference is a phenomenon that occurs when two waves meet while traveling along the same medium. The interference of waves causes the medium to take on a shape that results from the net effect of the two individual waves upon the particles of the medium.

What are stationary waves?

This is defined as wave motions that store energy rather than transferring energy to other locations.

What is forcing frequency?

This is shown as the frequency of wave energy from an external source and has been coupled up to a resonator where there is efficient energy transferring.

What is natural frequency?

A resonator will take onto the series of natural frequencies where it corresponds to the same number of wavelengths.

What is resonance?

Resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with