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The wavelength of a sound wave can be calculated using the formula: wavelength = speed of sound / frequency. Assuming the speed of sound in air is around 343 m/s, the wavelength of a sound wave with a frequency of 42 Hz would be approximately 8.17 meters.

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Q: What is the wavelength of a sound whose frequency is 42 Hz?
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Expected frequency for a person having tongue rolling ability and attached earlobe?

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What is the frequecy of a wave?

The resonant frequency depends on the mass and bulk modulus of water and also varies with pressure and slightly with temperature. It is possible to split water by a frequention that lies around 42 Kilohertz. The frequency is never exactly right because you would need 100% pure water to achieve the theoretical frequency. Even distilled water contains a lot of impurities and is not just pure H2O. The splitting of water was purportedly invented by Stanley Meyer who claimed that electrolysis at 42KHz split water into hydrogen and oxygen using less energy than was released when the two elements were combusted back into a water vapour. The claims were never proven and his work was widely discredited among the scientific community. To date there have been no peer reviews of his work and the experiments have not been repeated. Meyer died in 1998. Although an autopsy showed death by natural causes, some say he was killed to prevent his technology being further developed. Meyer's work will be the subject of debate for many years to come but 12 years after his death, his claims have still not been proven.