If NEPA charges 5k per kWh, what is the cost of operating for 24 hours a lamp requiring 1A on a
200V line? A. 24K B. 55K C. 40K D. 26K
E. 32K.

Explain vector addition, triangle method and parallelogram method

Glass is transparent to visibile light under normal conditions; however, at extremely high intensities, glass will absorb most of the light incident upon it. this works through a process known as multiphoton absorption. in this process, several photons are absorbed at the same time. if very intense light whose photons carry 2ev of energy is shined onto a material with a band gap of 4ev, that light can be absorbed through two-photon absorption, because two photons have the right amount of energy to bridge the band gap. what is the minimum number of photons of 800-nm light that are needed to equal or exceed the band gap of fused silica glass

Select all the correct answers. which three statements about electromagnetic radiation are true?