Calculate the potential energy of a stone of mass 0.5g thrown vertically upward with a velocity of 10m/s. calculate: 1. The potential energy at the greatest height and value of h
2. The kinetic energy on reaching the ground again

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

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

What are the similarities & differences between a thermistor and a light dependent resistor in physics?