3) A gas that has a volume of 28 liters, a temperature of 318K, and an unknown pressure has its volume increased to 34 Liters and its temperature decreased to 308K. If I measure the pressure after the change (P2) to be 2.0 atm what was the original pressure of the gas?

i think the answer is b

b.transmitters send radio waves, and receivers capture radio waves.

option number c is the right answer.

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