When a person jumps up he or she is able to come down because of what?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Sound is a disturbance that travels through a medium as a

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=