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Ultraviolet light of wavelengths, 800Å and 700Å, when allowed to fall on hydrogen atoms in their ground state,

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Ultraviolet light of wavelengths, 800Å and 700Å, when allowed to fall on  hydrogen atoms in their ground state, are found to liberate electrons with kinetic energy 1.8 and 4.0eV, respectively. Find the value of Planck’s constant.

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T = hν − W(Einstein’s equation)

T1 = hc/λ1 − W

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