School of Physics Lecture Demonstration Manual

Wb-5 Chladni Figures (Acoustically driven)

Published: Tuesday 14 March 2006 - Updated: Wednesday 30 March 2011

Aim

To demonstrate the modes of vibration of a plate.

Apparatus

Diagrams

Click on pictures to enlarge.

Chladni Figures Diagram

Chladni Figure 1

Chladni Figure 2

Chladni Figure 3

Chladni Figure 5

Chladni Figure 6

Chladni Figure 7

Chladni Figure 8

Chladni Figure 9

Chladni Figure 10

Chladni Figure 11

Chladni Figure 12

Chladni Figure 13

Chladni Figure 14

Chladni Figure 15

Chladni Figure 16

Chladni Figure 17

Chladni Figure 18

Chladni Figure 19

Chladni Figure 20

Chladni Figure 21

Chladni Figure 22

Chladni Figure 23

Chladni Figure 24

Chladni Figure 25

Videos

Chladni Figures

Description

A plate supported at its centre is mounted a few millimetres above a horn loudspeaker driven by a signal generator and public address amplifier. Salt is spread across the surface and accumulates along nodal lines upon excitation. The apparatus is enclosed within a bell jar to reduce the sound level to acceptable levels. Modes of vibration are quite easily observed. Listed below are some frequencies that produce useful results. It will be observed that finer particles congregate at the antinodes. This is explained by the fact that these particles are predominately under the influence of the air motion caused by the vibrating plate.

Safety notes

Electrical safety 

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