A47.5 g block of an unknown metal is heated in a hot water bath to 100.0 c. when the block is placed in 130.0 g of water at 25.0 c, the final temperature is 28.0 c. determine the specific heat of the unknown metal

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?