If it tales 3.36 times 10^-19 J of energy to eject an electron from the surface

Question

If it tales 3.36 times 10^-19 J of energy to eject an electron from the surface of a certain metal, calculate the frequency of the light that can be ionize the metal. th4e longest possible wavelength (in nanometers), of light that can be ionize the metal Calculate the mass (in kg) of 1.50 gallon gasoline (C_8H_18). The density of gasoline is 0.79 g/mL. (1.0 gal. = 3.8 L) A component of protein called serine has an approximate molar mass of 100 g/mole. If the percent composition is as follows, what is the empirical and molecular formula of serine? C = 34.95 %H = 6.844 % O = 46.56 %N = 13.59%

Explanation / Answer

Ans (a) E = hv

v = 3.36 * 10 ^ -19/(6.626 * 10 ^ -34)

v = 5 * 10^ 14

E = hc / lamha

lamda = hc / E

lamda = 5.91 * 10^ -7 m

= 0.0591 nm

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