"In this problem, you calculated that when the wavelength of incoming photons goes down by a factor of two, from 800 nm to 400 nm, the stopping potential required increases by more than a factor of three, from 0.6 V to 2.15 V. In general, for a real material with a positive work function, how will the stopping potential change when the wavelength goes down by a factor of N? "

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2