As more resistors are added in parallel across a constant voltage source, the power supplied by the source a. decreases. b. does not change. c. increases.

As more resistors are added in parallel across a constant voltage source, there are more paths for current to take.  So more current dribbles out of the source, and the total current supplied by the source increases.

The power supplied by the battery is (voltage) x (current).  So if the voltage is constant and the current increases, the power being supplied must also increase.

choice-c

answer: 31, 5556. 952 seconds

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