Using values from Table 7.1, how many DNA molecules could be broken by the energy carried by a single electron in the beam of an old-fashioned TV tube? (These electrons were not dangerous in themselves, but they did create dangerous x rays. Later model tube TVs had shielding that absorbed x rays before they escaped and exposed viewers.)

Data given in Table 7.1

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Big Bang Object/phenomenon Energy released in a supernova Fusion of all the hydrogen in Earth's oceans Annual world energy use Large fusion bomb (9 megaton) 1 kg hydrogen (fusion to helium) 1 kg uranium (nuclear fission) Hiroshima-size fission bomb (10 kiloton) 90,000-metric ton aircraft carrier at 30 knots 1 barrel crude oil 1 ton TNT Energy in joules 1068 1044 1034 4x1020 3.8×10¹6 6.4×10¹4 8.0x10¹3 4.2x1013 1.1×1010 5.9x10⁹ 4.2×10⁹