22. The surface of some metal is radiated by
waves of 2, 3.5 x 10-?m and 664841
hg=6.2 x 10-7m, respectively. The ratio of the
stopping potentials in two cases is 2:1. The
work function of the material is ......eV.
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1. An iron pillar has some part in the form of a right circular cylinder and remaining in the form of a right circular cone. The radius of the base of each of cone and cylinder is 8 cm. The cylinderical part is 240 cm high and the conical part in 36 cm high. Find the weight of the pillar if one cu. cm of iron weighs 7.8 grams.
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