The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0 . 710 V . When the incident wavelength is changed to a new value, the stopping potential is 1 . 43 V . The new wavelen

Question

The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0 . 710 V . When the incident wavelength is changed to a new value, the stopping potential is 1 . 43 V . The new wavelength is :

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Correct answer: A. 382 &#160; nm

h c &#955; = &#981; + e V s 1240 491 = &#981; + 0 . 71 &#160; &#160; &#160; &#160; &#160; &#160; . . . 1 1240 &#955; = &#981; + 1 . 43 &#160; &#160; &#160; &#160; &#160; &#160; . . . 2 &#8756; &#955; = 382 &#160; nm

The stopping potential for electrons emitted from a photosensitive surface illuminated by light of wavelength 491 nm is 0 . 710 V . When the incident wavelength is changed to a new value, the stopping potential is 1 . 43 V . The new wavelength is :

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