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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A 40 W ultraviolet light source of wavelength 2480 A illuminates a magnesium (Mg) surface placed 2 m away. Determine the number of photons emitted from the surface per second and the number incident on unit area

A 40 W ultraviolet light source of wavelength 2480 A illuminates a magnesium (Mg) surface placed 2 m away. Determine the number of photons emitted from the surface per second and the number incident on unit area

emitting electrons. Assuming that the work function of the surface can be neglected. Find the de-Broglie wavelength of electrons emitted. X-rays of wavelength lemda fall on photo-sensitive surface