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------------------------------------------------ Why is a triple beam balance called a "triple beam balance"?

A. One main beam and three minor beams for added speed.
B. Three beams.
C. Five beams.
D. Two beams with two extra beams in storage.

A triple beam balance has three beams that are used to measure mass by achieving a state of equilibrium. This setup allows for precise and quick weight measurements. Thus, the correct response to the query is that it contains three beams.

Explanation:

Understanding the Triple Beam Balance

A triple beam balance is named for its unique design, consisting of three beams that allow for precise measurements of mass. Each of the three beams holds different weights that can be adjusted to balance against the mass being measured. This construction helps in quickly determining the mass of an object by sliding weights along the beams until equilibrium is achieved.

In operation, the user places the item to be weighed on the platform and adjusts the weights on the beams until the pointer is aligned with the zero mark. The total mass can then be read directly from the scales of the beams. Therefore, the correct answer to the question is that it has three beams.

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