One of the emission spectral lines for be3+ has a wavelength of 466.4 nm for an electronic transmission that begins in the state with n = 6. what is the principal quantum number of the lower-energy state corresponding to this emission?

What is the relationship between the wavelength of a wave and it's energy?

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.

What sort of waves exhibit the doppler effect?