Asked by Noone
A blacksmith strikes a piece of metal with a hammer repeatedly. The metal slowly begins to glow as the temperature increases, and the metal becomes more malleable. Which changes on a microscopic level led to the visible changes in the properties of the metal?
A. The individual temperature of the particles increased.
B. The kinetic energy of the particles decreased.
C. The potential energy of the particles decreased.
D. The average speed of the particles increased.
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D
When the metal is hammered its internal (thermal) energy rises, which means the atoms vibrate faster — the average speed (and thus average kinetic energy) of the particles increases. That higher kinetic energy raises the temperature (causing red glow) and makes the metal more malleable by easing dislocation motion. Option A is incorrect because temperature is a macroscopic average, and C and B are the opposite of what happens.
When the metal is hammered its internal (thermal) energy rises, which means the atoms vibrate faster — the average speed (and thus average kinetic energy) of the particles increases. That higher kinetic energy raises the temperature (causing red glow) and makes the metal more malleable by easing dislocation motion. Option A is incorrect because temperature is a macroscopic average, and C and B are the opposite of what happens.
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