What are the wavelengths of sound waves at the limits of human hearing - 20 Hz and 20 kHz? The speed of sound in 20 ºC (72 ºF) air is 343 m/s. 4 points

The wavelength of microwaves in an oven is 12 cm. What is the frequency of the waves?

What is the frequency of a photon that has a wavelength of 4.87 x 10^7 m?

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?