20.
if we have constant velocity when drawing a free-body diagram, it means the forces must
group of answer choices

a. be present
b. be labeled
c. cancel
d. be in the same direction

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=

What sort of waves exhibit the doppler effect?

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?