The stopping potential when a metal surface is illuminated by light of wavelength \( \lambda \) is \( 15\,V \). The stopping potential when the same surface is illuminated by light of wavelength \( 4\lambda \) is \( 3\,V \). The ratio of threshold wavelength to the initial incident wavelength \( \lambda \) is:
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In photoelectric effect, stopping potential is directly related to frequencyAlways use two equations to eliminate constants like \( hc/e \).