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user100 [1]
3 years ago
5

An engine has an energy input of 125 J, and 35 J of that energy is transformed into useful energy. What is the efficiency of the

engine?
Physics
2 answers:
Korolek [52]3 years ago
8 0
Efficiency = (useful output) / (input)

Efficiency = (35 J) / (125 J) = 0.28  =  28%
Anna007 [38]3 years ago
8 0

Efficiency is equal to 35 / 125 * 100 which is equal to 28%.


Efficiency is the ratio of the useful work performed by a machine or in a process to the total energy that it consumed.


So basically it is the useful output which in this case was 35 J divided by the total input given to the machine which was 125 J in this case multiplying by 100 to get the percentage.


If we did not need the percentage then we could have simply not multiplied it by 100.

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a) 23.2 e V

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Explanation:

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A photon of energy ionized from ground state and electron of energy K is released.

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K combine with photon in first exited state giving out photon of energy

h\nu_2 =\dfrac{hc}{\lambda}=\dfrac{12400}{466}

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h c = 6.626 ×  10⁻³⁴ ×  3  × 10⁸  = 12400 e V A°

K + ( 3.4 ) = 26.6 e V

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b) energy of the original photon

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h ν₁  = 23.2 + 13.6

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3 years ago
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When two mechanical waves that have positive displacements from the equilibrium position meet and coincide, a constructive interference occurs.

Option A

<h3><u>Explanation:</u></h3>

Considering the principle of superposition of waves; the resultant amplitude of an output wave due to interference of two or more waves at any point is given by individual addition of their amplitudes at that point. Two waves with positive displacements refer to the fact that crest of the both the waves are on the same side of displacement axis, either both are positive or both are negative, similarly with their troughs.

If such two waves with their crest on crest meet at any point, by superposition principle. their individual amplitude gets added up and hence the resultant wave after interference is greater in amplitude that both the individual waves. This is termed as a constructive interference. Destructive interference on the other hand is a condition when one of the two waves has a positive displacement and other has a negative displacement (a condition of one’s crest on other’s trough); resulting in amplitude subtraction.

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