![]() I have been able to prove that, when an iron or steel wire is thrown into longitudinal vibrations, so as to produce a musical note, the pitch of this note becomes lower as we raise the temperature, even when the wire is heated for the first time after it has left the maker's hands. Note that the velocity is faster at higher temperatures and slower for heavier gases. ![]() When, however, we come to such small molecular displacements as are involved in the passage of sound through a wire, even the apparent increase of elasticity mentioned above vanishes. The speed of sound in steel is equal to : A 340 m / s B 1500 m / s C 3270 m / s D 5100 m / s Easy Solution Verified by Toppr Correct option is D) The speed of sound varies from one material to another. Since the speed of sound is equal to v d p d, the speed is equal to v R T M. and afterwards cooled, subsequent tests will always show a less elasticity at the higher temperature than at the lower, if sufficient rest after cooling be allowed. 129-131), and if the wire be repeatedly heated to 100° C. but the apparent temporary increase of elasticity is really a permanent one ( Phil. than at 0° C., provided we begin with the lower temperature first and the wire has not, after the original annealing, been previously raised to 100° C. It is true that the longitudinal elasticity of iron, as determined by the static method. For example, sound travels more than four times faster in water and more than seventeen times faster in steel than it does in air. Now in no sense whatever is this statement correct. According to Wertheirn, the velocity of sound in iron and steel is increased by rise of temperature not extending beyond 100° C. ![]() I VENTURE to draw attention to an error relating to the above subject, which, originating with Wertheim, still holds a place some of our modern books on science.
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