The minimum energy required for the emission of photoelectron from the surface of a metal is 4.95 × 10- 19 J . Calculate the critical frequency of the photon required to eject the electron. h= 6.6 × 10- 34 J sec .

Question

The minimum energy required for the emission of photoelectron from the surface of a metal is 4.95 × 10- 19 J . Calculate the critical frequency of the photon required to eject the electron. h= 6.6 × 10- 34 J sec . (A) 7.5 × 1014s- 1 (B) 7.5 × 1013s- 1 (C) 7.5 × 1016s- 1 (D) 7.5 × 1019s- 1

Tardigrade Admin · Accepted Answer

Minimum energy required for the emission of photoelectrons

= 4.95 \times 1 0^{- 19} J

Let the critical frequency or threshold frequency of the photon to eject the electron is

v se c^{- 1}

.
We know,

E = h υ or υ = \frac{E}{h} = \frac{4.95 \times 1 0 ^{- 19}}{6.6 \times 1 0 ^{- 34}} = 7.5 \times 1 0^{14} s^{- 1}

Q. The minimum energy required for the emission of photoelectron from the surface of a metal is $4.95 \times 1 0^{- 19} J$ . Calculate the critical frequency of the photon required to eject the electron. $h = 6.6 \times 1 0^{- 34} J sec$ .

$7.5 \times 1 0^{14} s^{- 1}$

$7.5 \times 1 0^{13} s^{- 1}$

$7.5 \times 1 0^{16} s^{- 1}$

$7.5 \times 1 0^{19} s^{- 1}$

Q. The minimum energy required for the emission of photoelectron from the surface of a metal is 4.95×10−19J . Calculate the critical frequency of the photon required to eject the electron. h=6.6×10−34Jsec .

7.5×1014s−1

7.5×1013s−1

7.5×1016s−1

7.5×1019s−1

Minimum energy required for the emission of photoelectrons =4.95×10−19J Let the critical frequency or threshold frequency of the photon to eject the electron is vsec−1 . We know, E=hυorυ=hE​=6.6×10−344.95×10−19​=7.5×1014s−1

Q. The minimum energy required for the emission of photoelectron from the surface of a metal is $4.95 \times 1 0^{- 19} J$ . Calculate the critical frequency of the photon required to eject the electron. $h = 6.6 \times 1 0^{- 34} J sec$ .

$7.5 \times 1 0^{14} s^{- 1}$

$7.5 \times 1 0^{13} s^{- 1}$

$7.5 \times 1 0^{16} s^{- 1}$

$7.5 \times 1 0^{19} s^{- 1}$