Adouble-slit diffraction pattern is formed on a distant screen. if the separation between the slits decreases, what happens to the distance between interference fringes? assume the angles involved remain small.

the distance between interference fringes remains the same.
the effect cannot be determined unless the distance between the slits and the screen is known.
the distance between interference fringes also decreases.
the distance between interference fringes increases.

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