Awave has a wavelength of 15 mm and a frequency of 7 hertz. what is its speed?

Wave functions describe orbitals in a hydrogen atom. each function is characterized by 3 quantum numbers: n, l, and ml. if the value of n = 2: the quantum number l can have values from to . the total number of orbitals possible at the n = 2 energy level is .

What would be the strength of earth's gravitational field at a point where an 80.0 kg astronaut would experience a 80% reduction in weight

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87