If the binding energy of electrons in a metal is 250 kJ / mol, what should be the threshold frequency of the striking photons in order to free an electron from the metal surface?

Question

If the binding energy of electrons in a metal is 250 kJ / mol, what should be the threshold frequency of the striking photons in order to free an electron from the metal surface? (A) 6.26 × 1014 s-1 (B) 12.4 × 1014 s-1 (C) 6.26 × 1012 s-1 (D) 12.4 × 1012 s -1

Tardigrade Admin · Accepted Answer

Binding energy of electron =250 KJ / mol Binding energy of one electron .=(250 × 103/6.023 × 1023) rfloor ⇒ 4.15 × 10-19 J Binding energy =h v0 v0 is threshold frequency beginarrayl 4.15 × 10-19=6.625 × 10-34 × v0 v0=6 × 1014 sec -1 endarray

Q. If the binding energy of electrons in a metal is $250 k J / m o l$ , what should be the threshold frequency of the striking photons in order to free an electron from the metal surface?

$6.26 \times 1 0^{14} s^{- 1}$

$12.4 \times 1 0^{14} s^{- 1}$

$6.26 \times 1 0^{12} s^{- 1}$

$12.4 \times 1 0^{12} s^{- 1}$

Q. If the binding energy of electrons in a metal is 250kJ/mol, what should be the threshold frequency of the striking photons in order to free an electron from the metal surface?

6.26×1014s−1

12.4×1014s−1

6.26×1012s−1

12.4×1012s−1

Binding energy of electron =250KJ/mol Binding energy of one electron =6.023×1023250×103​⌋ ⇒4.15×10−19J Binding energy =hv0​ v0​ is threshold frequency 4.15×10−19=6.625×10−34×v0​v0​=6×1014sec−1​

Q. If the binding energy of electrons in a metal is $250 k J / m o l$ , what should be the threshold frequency of the striking photons in order to free an electron from the metal surface?

$6.26 \times 1 0^{14} s^{- 1}$

$12.4 \times 1 0^{14} s^{- 1}$

$6.26 \times 1 0^{12} s^{- 1}$

$12.4 \times 1 0^{12} s^{- 1}$