Q1 :- Calculate the ratio of spontaneous and stimulated emission light of wavelength ( 590 nm ) at room temperature(300Ko ), and show that : 1. The equilibrium populations of levels energy of this transition? 2. At what temperature is the rate stimulated emission is equal to the rate spontaneous emission?

Establish the relevant theoretical model:1. Write the two equations giving the maximum kinetic energy of the electrons ejected by the photoelectric effect.2. Use these two equations to obtain the expression for the stopping potential ΔVarr as a function of e, h, f and ø.3. Is the relationship between ΔVarr and f linear? If not, linearize it. What do the slope and y-intercept of your line represent?4. How will you use the data from linear regression to calculate the value of the Planck constancy h as well as the work of extraction ø?