Athin uniform film of refractive index 1.750 is placed on a sheet of glass with a refractive index 1.50. at room temperature ( 22.2 ∘c), this film is just thick enough for light with a wavelength 583.5 nm reflected off the top of the film to be canceled by light reflected from the top of the glass. after the glass is placed in an oven and slowly heated to 174 ∘c, you find that the film cancels reflected light with a wavelength 587.5 nm .

Explanation:

In this way we understand that the condition for destructive interference is

The smallest non zero thickness is,

At

At

The coefficient of linear expansion is

  1.the balanced   chemical equation is as below

cu +   2 ag(no)₃ → cu(no₃)₂   +2 ag

2.the   much silver   produced   is   50.9 g

step 1: find the   moles of cu

moles =   mass÷   molar mass

  from periodic table the molar mass of cu = 63.5 g/mol

moles is therefore = 15.00 g÷ 63.5 g/mol = 0.236   moles

step 2: use the mole ratio to determine the   moles of ag

from equation above   cu: ag   is 1: 2

therefore the moles of ag   =0.236   moles   x 2/1 =0.472   moles

step 3: find the mass   of ag

mass = moles x molar mass

from periodic table   the molar mass of ag =107.87 g/mol

mass   = 0.472   moles x 107.87 g/mol = 50.9 g

3.   the   much   silver   collected worth is   1.797 oz

  convert   50.9 g   to oz

that is   1 gram = 0.0353 oz

          50.9 grams =?   oz

by cross multiplication

={(50.9 grams x 0.0353 oz) / 1   gram}   =1.797 oz