The work function for sodium surface is 2.0 eV and that for aluminium surface is 4.2 eV. The two metals are illuminated with appropriate radiations so as to cause photoemission. Then

Question

The work function for sodium surface is 2.0 eV and that for aluminium surface is 4.2 eV. The two metals are illuminated with appropriate radiations so as to cause photoemission. Then (A) the threshold frequency for sodium will be less than that for aluminium (B) the threshold frequency of sodium will be more than that of aluminium (C) both sodium and aluminium will have the same threshold frequency (D) none of the above

Tardigrade Admin · Accepted Answer

As work function W=h v0, where v0 is the threshold frequency. Greater the work function, greater is the threshold frequency. Therefore, the threshold frequency of sodium will be lesser than that for aluminium.

Q. The work function for sodium surface is $2.0 e V$ and that for aluminium surface is $4.2 e V$ . The two metals are illuminated with appropriate radiations so as to cause photoemission. Then

the threshold frequency for sodium will be less than that for aluminium

the threshold frequency of sodium will be more than that of aluminium

both sodium and aluminium will have the same threshold frequency

none of the above

As work function $W = h v_{0}$ , where $v_{0}$ is the threshold frequency.
Greater the work function, greater is the threshold frequency. Therefore, the threshold frequency of sodium will be lesser than that for aluminium.

Q. The work function for sodium surface is 2.0eV and that for aluminium surface is 4.2eV. The two metals are illuminated with appropriate radiations so as to cause photoemission. Then