Transcript Cymbal
Problem no. 4 TEAM TALNET Discharging an electronic flash unit near a 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 Distance We have measured intensity of sound emited by cymbal We have observed quick decrease of sound with increasing distance. Green line – distance 1 cm Blue line – distance 6 cm Red 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 Paperclip We tried to determine the energy of photons, which are emitted by flash. We used following relations: Purple – fall of paperclip from 15 cm height Blue – fall of paperclip from 2 cm height Red – released flash from 1 cm distance Emax – potential energy of paperclip in specific height (h) m – mass of paperclip g – gravity constant Ef – aproximated energy of one flash a – aproximated coefficient k – number of photons h – Planck constant f – frequency of average photon c – speed of light λ – 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