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Results tagged with homework-and-exercises
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user 187096
Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.
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Luminance relation between LEDs when connected in series
I am reviewing a homework problem where we are given three LEDs; in the blue ($450$ nm), in the green ($550$ nm) and in the red ($650$ nm). We are told that the current efficiency $$\eta=\frac{Luminan …
- 111
-1
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answer
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Proving that the Euler-Lagrange Equation has no solution [closed]
I'm trying to show that the Euler - Lagrange equation for the functional $$I(y)=\int_{a}^{b} y\:dx$$
subject to $y(0)=y(1)=0$ has no solutions.
The Euler - Lagrange equation states that:
$$\frac{d} …
- 111