In my day, everybody loved handball, roller skates, and bicycles. Handball was the biggest. Day and night, I would hear the echo of rubber balls hitting cement walls. To this day, whenever I hear a rubber ball slamming against cement or brick, it brings me back to childhood (it has to be a pink Spalding rubber ball; a tennis ball or some other ball just isn't the same!)
depends some times four wheel drive are in and sometime they mean stay off road unless you got chains or studs really depend is it snow or is it ice snow not that bad and 4 wheel should be ok with or without ice stay at home
The coating serves as a non-reflective coating by causing destructive interference between light reflected from it's upper and lower surface. Destructive interference occurs when the path difference between the re-combining waves is a ?λ. Waves reflected at both surfaces suffer a ? wave phase change (as they both reflect off materials of greater refractive index) .. so the path difference is due to one set of waves having travelled further (ie through the film) For near normal incidence, this extra distance is 2d (d coating thickness,2d ↓↑) For destructive interference .. 2d ? λ' .. (λ' wavelength in film λ(air) / n ) 2d ? [λ(air) / n] d ? (522^-9m / 1.375) .. .. ?d 9.50^-8 m [d ?λ' gives the min thickness, also works when d any odd number of ?λ' .. 3,5,7 ..]
