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The work functions (Wo) of some metals a...

The work functions (Wo) of some metals are list below.

The mumber of metals which will show
photociectric effect when light of 360 nm wavelength falls on the metal is ______ .
[h and
`=6.626xx10^(-34)Js,c=3xx10^(8)ms^(-1)1eV=1.6xx10^(-19)J` ]

Text Solution

Verified by Experts

The correct Answer is:
3
`E=(hc)/(lamda)`
`=(6.626xx10^(-34)xx3xx10^(8))/(360xx10^(-9))`
`=5.52xx10^(-19)J=(5.52xx10^(-19))/(1.6xx10^(-19))=3.45 eV`
Elements having `W_(0)` less than 3. 45 eV will show photoelectric effect.
i.e., Li, Na, K `implies` Three elements.
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