The ground state energy of a particular atom is -54.4eV, calculate the energy of the 3rd excited state of this atom

What is the relationship between the wavelength of a wave and it's energy?

Initially, a particle is moving at 5.33 m/s at an angle of 37.9° above the horizontal. two seconds later, its velocity is 6.11 m/s at an angle of 54.2° below the horizontal. what was the particle's average acceleration during these 2.00 seconds in the x-direction (enter first) and the y-direction?

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