Recent content by et_al

I had such a flashlight, and I don't think it is a usefulness design. From other perspective, this kind of generater efficiently emits a sufficently high voltage to drive LEDs with such a simple structure. You can note that there are two pieces of iron sheet on the both sides of the coil, and...

I think your result is correct.

Red-hot iron is not actually an ideal blackbody. For this non-ideal blackbody, the monochromatic emissivity ##\varepsilon_\lambda## is defined as the ratio of the monochromatic emissive power of the real surface to the monochromatic emissive power of a black body. It is less than one. If the...