Among the following wavelengths, one is absent while the rest are present in the X-rays emitted by a Coolidge tube. Identify the absent wavelength.

Step-by-step solution

In a Coolidge tube, the emitted X-rays have a continuous spectrum with a well-defined minimum wavelength, known as the cutoff wavelength _ min , given by _ min = hc eV , where V is the accelerating voltage. All wavelengths greater than or equal to _ min are present in the continuous X-ray spectrum, while wavelengths shorter than _ min are absent. If only one of the given wavelengths is absent while the rest are present, the absent wavelength must be the shortest one among the given options. If a longer wavelength w