A semiconducting material has a band gap of 2.15 eV. What are the (a) minimum and (b) maximum wavelengths of visible light at which the material is transparent

(75°f − 32) × 5/9 = 23.889°c

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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