Secure l httpsllsession Das 76845578 PSS 38.1 Photons 8 of 11 For this aterial,

Question

Secure l httpsllsession Das 76845578 PSS 38.1 Photons 8 of 11 For this aterial, what stopping potental would be required for light at a wavelength of 400 nm PSS 38.1: Photons Express your answer in volts to three significant figures. Learning Goal: Vo 2.15 V To practice Problem-Solving Strategy 38.1 Sutomat Hints My Answers Give Up Review Part For a certain material in a experiment, you measure a stopping potential of Correct 0,6 Vfor 800 nmlight What stopping potential would be required for light at a wavelength of400 EVALUATE your answer Part C in this problem, you calculated that when the wavelength ofincoming photons goes down by a factor of two, rom 800 nm to am the potental required by more than a tactor of three, from 0 6 Vto 2 15 V for a real material with a positive work function, how will the stopping potential change when the wavelength goes down by a tactor o The stopping potential wil always increase sometimes by a tactor ess than Nand sometimes by a factor more N depending onthe exact values involved The stopping potential will either increase or decrease, depending on the ecact values involved. The stopping potential always increase by more than a factor of N The stopping potential always increase but by less than a tactor of 2N

Explanation / Answer

Stoping potential = work function + KEmax

E = hc/lambda

Hence when wavelength decreases

E increases

So KE will increase

Hence Stopping potential also increases by a factor greater than N

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