When an electron drops from the e2 level to the e1 level, the atoms are said to undergo emission. calculate the wavelength (in nm) of the photon emitted in this process. enter your answer in scientific notation.

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?