Tech a says that oversteer is when the front slip angles are larger than the rear slip angles. tech b says that understeer is when the rear slip angles are larger than the front slip angles. who is correct? \

Oversteer and Understeer are terms that are commonly use in Vehicles maintenance. In the statement given, Tech A and B are correct.

When the ratio of front to rear slip angles is said to be bigger or greater than 1:1, the vehicle will be understeer, but if the ratio of less than 1:1, it will be said to be oversteer.

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d. air pressure decreases as altitude increases.

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m