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Problem no. 4
TEAM TALNET
Discharging an electronic flash unit neara cymbal will produce a sound from the cymbal.
Explain the phenomenon and investigate the relevant parameters.
A photo of cymbal
Theoretical background Determining main cause of emitted sound Measuring of sound Results Conclusion
Flash interacts with the material of the cymbal
Variants By flashing the sound wave is generated
This sound interact with the cymbal and emits another sound wave
Pressure wave Electromagnetic induction Light
A wave based on shift of grossness of air which is emitted when the flash is triggered could make the cymbal to emit sound.
We tried clap hands putting of transparent materials between flash
and cymbal (glass, plastic materials) flash on thermistor
When the flash is triggered, a very high current goes through the gas-filled tube. Therefore could be generated changing magnetic field that might take effect on cymbal.
Experiments flashing on razor placed on edge of table in
near nonbalanced state nonconductor between flash and cymbal using flash on paper
All results of experiments are indicating, that the main cause of this phenomenon is light (photons).
We have measured following characteristics of flash and cymbal
We observed: difference between different places on cymbal decreasing sound intensity with increasing
distance flash from cymbal dependence on cymbal´s colour comparison energy of released flash and
kinetic energy of falling paperclip
We have measured intensity of sound emited by cymbal
We have observed quick decrease of sound with increasing distance.
Green line – distance 1 cmBlue line – distance 6 cmRed line – distance 17 cm
We tried to find entries to figure out how much energy is released from gas-filled tube when flash is triggered.
We have found these approximated data: Duration of flash Power of flash Factor fo conversion from electrical energy to
optical energy Flash is acting approximately in area of 1 sr
We tried to determine the energy of photons, which are emitted by flash. We used following relations:
Purple – fall of paperclip from 15 cm heightBlue – fall of paperclip from 2 cm heightRed – released flash from 1 cm distance
Emax – potential energy of paperclip in specific height (h)m – mass of paperclipg – gravity constantEf – aproximated energy of one flasha – aproximated coefficientk – number of photonsh – Planck constantf – frequency of average photonc – speed of lightλ – wavelength of average photon
We have determinated, that the main cause of is light (photons)
We have observed basic relations between flash and emitted sound.
TEAM TALNET