A Stopping Potential of 0

question 36

Multiple Choice

A stopping potential of 0.50 V is required when a phototube is illuminated with monochromatic light of wavelength 590 nm.Monochromatic light of a different wavelength is now shown on the tube,and the stopping potential is measured to be 2.30 V.What is the wavelength of this new light? (c = 3.00 × 10⁸ m/s,e = -1.60 × 10^-19 C,h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.60 × 10^-19 J)

• A)320 nm
• B)300 nm
• C)340 nm
• D)360 nm
• E)410 nm

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