# LONGITUDINAL WAVES

### Features of Longitudinal Waves Software:

The Longitudinal waves is a physics software, which demonstrates the transmission and nature of longitudinal waves by showing the example of addition of two longitudinal waves. The user is given with the options to change the frequency, amplitude, phase and direction of waves.

• Open Genius Maker software and click "Longitudinal Waves" button. It opens the Longitudinal Waves window as shown above.
• On opening you will see 3 waves shown by default. The waves are named as Wave - A, Wave - B and Superposition of Waves A and B.
• Just click "Zoom in" button.
• You will see that the entire graphics area gets zoomed.
• The particles are shown in different colours for easy identification.
• You may go on clicking the "Zoom in" button many times to see the particle movement closely.
• Similarly you may go on clicking "Zoom out' button many times to see the waves in totality.
• You may pause the waves at any time by clicking the "Pause" button. Click the same button to play again.

Case 1

• Set the following in Wave - A control box
• Amplitude = 1 unit (ie., maximum position)
• Frequency = 0.4 Hz
• Direction  - Towards left
• Set the following in Wave - B control box
• Amplitude = 1 unit (ie., maximum position)
• Frequency = 0.4 Hz
• Direction  - Towards right
• Phase = 180
• If the waves are not moving click the "Play" button.
• The present setting explains the concept of standing waves. You may see that at certain points of the superposition wave, the particles are stationery. They represent the node points of standing wave.
• Try reducing and increasing the value of amplitude of wave A or B and note the changes.
• Try reducing and increasing the value of frequency of wave A or B and note the changes.
• Try changing the phase value of wave B and note the changes.
• You may use "Zoom in" and "Zoom out" buttons at any moment to see the real effect and phenomena of wave superposition.
• Click "Play/Pause" button to stop and restart the waves.

Case 2

• Set the following in Wave - A control box
• Amplitude = 1 unit (ie., maximum position)
• Frequency = 0.6 Hz
• Direction  - Towards right
• Set the following in Wave - B control box
• Amplitude = 1 unit (ie., maximum position)
• Frequency = 0.6 Hz
• Direction  - Towards right
• Phase = 18 0
• If the waves are not moving click the "Play" button.
• You can see that the particles of superposition wave are standstill. It explains the mutually canceling effect of 2 exactly similar waves with a phase difference of 180o
• Try reducing and increasing the value of amplitude of wave A or B and note the changes.
• Try reducing and increasing the value of frequency of wave A or B and note the changes.
• Try changing the phase value of wave B and note the changes.
• You may use "Zoom in" and "Zoom out" buttons at any moment to see the real effect and phenomena of wave superposition.
• Click "Play/Pause" button to stop and restart the waves.

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