Problem: R = 2.18x10-18 J;  h = 6.626x10-34 J•sec or 6.626x10-34 kg•m2 sec-1;  c = 3.00 x 10 8 m•sec-1; 1eV= 1.602x10-19 J a.) What is the energy of a photon with a wavelength of 335 nm?    b.) If a metal that has a work function of 2.80 eV, what wavelength of light is required to generate electrons with a kinetic energy of 1.02 eV?      c.) If a reaction is exothermic, does it mean that ΔE for the reaction is negative? Explain.   

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R = 2.18x10-18 J;  h = 6.626x10-34 J•sec or 6.626x10-34 kg•m2 sec-1;  

c = 3.00 x 10 8 m•sec-1; 1eV= 1.602x10-19 J

a.) What is the energy of a photon with a wavelength of 335 nm?

b.) If a metal that has a work function of 2.80 eV, what wavelength of light is required to generate electrons with a kinetic energy of 1.02 eV?

c.) If a reaction is exothermic, does it mean that ΔE for the reaction is negative? Explain.

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Based on our data, we think this problem is relevant for Professor Weber's class at UNT.