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Westkost [7]
4 years ago
13

A wave with a period of 1⁄3 second has a frequency of A. 67 Hz. B. 33 Hz. C. 300 Hz. D. 3 Hz.

Physics
1 answer:
Triss [41]4 years ago
3 0
A wave with a period of 1⁄3 second has a frequency of D. 3 Hz. To calculate this we will use the formula that represents the correlation between a frequency (f) and a time period (T): T = 1/f. Or: f = 1/T. The unit for the time period is second "s" while the unit for frequency is Hertz "Hz" (=1/s). We know that T = 1/3 s. That means that f = 1/(1/3s) = 3 1/s = 3 Hz.
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We can solve the problem by using the first law of thermodynamics:

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\Delta U is the change in internal energy of the system

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In this problem, the work done by the system is

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with a negative sign because the work is done by the surrounding on the system, while the heat absorbed is

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with a negative sign as well because it is released by the system.


Therefore, by using the initial equation, we find

\Delta U=Q-W=-500 kJ+941.4 kJ=441.4 kJ

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