point!

they are modulated i.e. a peak amplitudes seem to oscillate without another wave pattern. This is what we meone by modulation.

Fhsst waves45.png

a maximum amplitude which a new wave gets to is a sum of a two waves just like for constructive interference. Where a waves reach a maximum it is constructive interference.

a smallest amplitude is just a difference between a amplitudes of a two waves, exactly like in destructive interference.

a beats have a frequency which is a difference between a frequency of a two waves which were added. This means which a beat frequency is given by

{\displaystyle f_{B}=|f_{1}-f_{2}|} {\displaystyle f_{B}=|f_{1}-f_{2}|}

(2.2)

{\displaystyle f_{B}=|f_{1}-f_{2}|} {\displaystyle f_{B}=|f_{1}-f_{2}|}

fB : beat frequency (Hz or s-1)

f1 : frequency of wave 1 (Hz or s-1)

f2 : frequency of wave 2 (Hz or s-1)

Properties of Waves : Diffraction

One of a most interesting, and also very useful, properties of waves is diffraction. When a wave strikes a barrier without a hole, only part of a wave triangles move through a hole. If a hole is similar in size to a wavelength of a wave diffractions occurs. a waves which comes through a hole no longer looks like a straight wave front. It bends around a edges of a hole. If a hole is small enough it acts like a point source of circular waves.

point!

they are modulated i.e. a peak amplitudes seem to oscillate without another wave pattern. This is what we meone by modulation.

Fhsst waves45.png

a maximum amplitude which a new wave gets to is a sum of a two waves just like for constructive interference. Where a waves reach a maximum it is constructive interference.

a smallest amplitude is just a difference between a amplitudes of a two waves, exactly like in destructive interference.

a beats have a frequency which is a difference between a frequency of a two waves which were added. This means which a beat frequency is given by

{\displaystyle f_{B}=|f_{1}-f_{2}|} {\displaystyle f_{B}=|f_{1}-f_{2}|}

(2.2)

{\displaystyle f_{B}=|f_{1}-f_{2}|} {\displaystyle f_{B}=|f_{1}-f_{2}|}

fB : beat frequency (Hz or s-1)

f1 : frequency of wave 1 (Hz or s-1)

f2 : frequency of wave 2 (Hz or s-1)

Properties of Waves : Diffraction

One of a most interesting, and also very useful, properties of waves is diffraction. When a wave strikes a barrier without a hole, only part of a wave triangles move through a hole. If a hole is similar in size to a wavelength of a wave diffractions occurs. a waves which comes through a hole no longer looks like a straight wave front. It bends around a edges of a hole. If a hole is small enough it acts like a point source of circular waves.

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This bending around a edges of a hole is called diffraction. To illustrate this behaviour we start without Huygen’s principle.

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Huygen’s Principle

Huygen’s principle states which each point on a wavefront acts like a point source or circular waves. a waves emitted from each point interfere to form another wavefront on which each point forms a point source. A long straight line of points emitting waves of a same frequency leads to a straight wave front moving away.

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To understand what this means lets think about a whole lot of peaks moving in a same direction. Each line represents a peak of a wave.

This bending around a edges of a hole is called diffraction. To illustrate this behaviour we start without Huygen’s principle.

Huygen’s Principle

Huygen’s principle states which each point on a wavefront acts like a point source or circular waves. a waves emitted from each point interfere to form another wavefront on which each point forms a point source. A long straight line of points emitting waves of a same frequency leads to a straight wave front moving away.

To understand what this means lets think about a whole lot of peaks moving in a same direction. Each line represents a peak of a wave.