What the frequency of the photon emitted when an electron goes from the 4th energy level (E4 = -0.85eV) to the 3rd energy level (E3 = -1.51eV)
a. 1.59x1014hz
b. 2.05 x1014hz
c. 3.65 x1014hz
d. 5.70 x1014hz
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c)as speed changes, wavelength and frequency change.

everything changes!

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

0.55x745.7j and a calculator