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68 The wavenumber of a radiation whose frequency is 7 5 10 s 1 is 1 1 25 m 1 2 0 25 m 1 3 2 5 m 1 4 25 m 1 69 The species which has the maximum charge to mass ratio is 1 Electron 3 Neutron 2 Proton 4 a particle
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