A scientist is studying the effects of sunlight on rose bushes. Which statement is a hypothesis that he can test by performing a scientific
investigation?
A. Rose bushes look more attractive on sunny days than on cloudy
days.
B. If roses are cut from the bush, people will think they smell better
than before they were cut.
C. If rose bushes receive more hours of sunlight each day, they will
grow taller
D. Roses are prettier than other kinds of flowers.

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

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

What are the applications of electromagnetic waves