The work function of the following metal is given Na = 2.75 eV, K=2.3 eV, Mo= 4.14 eV, Ni =5.15 eV which of these metal will not give a photoelectric emission for radiation of wave length 3300 A^@ from a laser source placed at 1m away from the metal . What happensif the laser is brought nearer and placed 50 cm away.

The work function of the following metal is given Na = 2.75 eV, K=2.3

1.	The work function of the following metal is given Na = 2.75 eV, K=2.3 eV, Mo= 4.14 eV, Ni =5.15 eV which of these metal will not give a photoelectric emission for radiation of wave length 3300 A^@ from a laser source placed at 1m away from the metal . What happensif the laser is brought nearer and placed 50 cm away.
Answer» Solution :`lambda=3300A^@,E=(hc)/(lambda)=(6.6xx10^(-34)xx3xx10^8)/(3300xx10^(-10)xx1.6xx10^(-19))eV~~3.8eV` WORK function of `M_o &NI gt 3.8` eV hence no PHOTOELECTRON emission from `M_o and Ni`.

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