1. The following information is printed on an electrical appliance. 200 V and 6 A. If the appliance is used for 1 hour a day and the cost of electricity is N$ 1.995 kW/h, how much would it cost to use everyday.
2.The rating plate for an electric hair dryer is given: 1500 W, 200 V and 40 Hz. If the dryer is used for 30 minutes a day, and the cost of electricity is N$ 1.995/kWh, how much would it cost to use everyday?

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