The threshold wavelength of a photo sensitive metal is 275 nm. Calculate the maximum velocity of the photo electrons ejected when light of 180nm incident on it.

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The threshold wavelength for certain metal is . When light of wavelength $\frac{λ_{0}}{2}$ is incident on it, the maximum velocity of photo electrons is $10^{6} m / s$ . If the wavelength of incident light is changed to $\frac{λ_{0}}{5}$ the maximum velocity of photo electrons is

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