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hello everyone welcome to easy edu and today we are going to solve this numerical this numerical is from the secondary physics book according to the numerical the sodium surface is illuminated with light of wavelength 300 nanometer the work function for sodium is 2.46 electron volt and we will determine the kinetic energy of the ejected electron and the cut-off wavelength for the sodium atom now from the given data we know that the valve length is given in nanometer we have wavelength which is denoted by lambda is equal to 300 nanometer we have converted this 300 nanometer into just meter which is 3.0 multiplied 10 power minus 7 meter now we know the value of plancks constant which is 6.63 multiply 10 power minus 34 joules second and this plancks constant can also be expressed in term of electron volt and the value of plancks constant in electron volt is 4.1 multiplied 10 power minus 15 electron volts second now the work function is given as 2.46 electron volt and what function is