Dull at room temperature, rings clearly after immersion in liquid nitrogen.
What it shows:
A lead bell, dull sounding at room temperature, rings brightly when cooled to liquid nitrogen temperatures.
How it works:
A lead bell at room temperature is dull in more ways than one. But its elasticity is temperature dependant, with an increase in elasticity as its temperature decreases. This increase in elastic modulus narrows the resonance response with frequency and increases the quality Q of the lead as...
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