Calculate the amount of potential energy a 200 kg car has on top of a 15 m hill. Equation: PE = mgh ; g = 9.8 m/s2

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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=

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)