An oil film with index of refraction 1.64 is trapped between two pieces of glass with index of refraction 1.43. no light is reflected by such a film when 578 nm light falls on it at normal incidence. what is the nonzero minimum thickness of the oil film that will satisfy these conditions? answer in units of nm.

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?