When we look into the sky every day we get to see the results of all the behaviors of waves. The blue color of the sky results from the scattering of sunlight by the air molecules. The blue light has a frequency of about 7.5 X 10^14 Hertz. What is the wavelength (nm) of this radiation

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.