Light of wavelength λ p h falls on a cathode plate inside a vacuum tube as shown in the figure. The work…

1. For large potential difference $\left(\text{V}\gg \frac{\varphi }{\text{e}}\right),{\lambda }_{\text{e}}$ is approximately halved if V is made four times
2. ${\lambda }_{\text{e}}$ increases at the same rate as ${\lambda }_{\text{ph}}for{\lambda }_{\text{ph}}<\frac{\text{hc}}{\varphi }$
3. ${\lambda }_e$ is approximately halved, if d is doubled
4. ${\lambda }_e$ decreases with increase in $\varphi and{\lambda }_{\text{ph}}$

Solution

Asked in: JEE Advanced 2016 (Paper 2)

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