Create a page showing data for each Abell cluster, presented so it's easy to see each cluster's average redshift and distance (e. g. Abel 1064: z=0.034, d=250 Mpc) and a short paragraph stating: The Hubble constant you found, H0, with (a realLinks to an external site.) citation. The distance to the furthest cluster you measured, in megaparsecs. The lookback time to that cluster in years (see step 6). To put that number in context, use Smithsonian's Interactive Timeline of Earth (Links to an external site.) to answer the question, "What was Earth like when the light from these galaxies started its journey?"

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

Which changes would result in a decrease in the gravitational force btween two objects? check all that apply

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.