In a photoelectric effect experiment, the maximum possible kinetic energy of the emitted photoelectrons is zero. The work function of the metal is $\phi = 20 \times 10 ^ { - 19 } \mathrm {~J}$. Find the frequency of the incident photon. (A) $3.0 \times \mathbf { 1 0 } ^ { \mathbf { 1 4 } } \mathbf { ~ H z }$ (B) $3.02 \times 10 ^ { 15 } \mathrm {~Hz}$ (C) $\mathbf { 1 . 5 } \boldsymbol { \times } \mathbf { 1 0 } ^ { \mathbf { 1 5 } } \mathbf { ~ H z }$ (D) $6.6 \times \mathbf { 1 0 } ^ { \mathbf { 1 4 } } \mathbf { ~ H z }$
In a photoelectric effect experiment, the maximum possible kinetic energy of the emitted photoelectrons is zero. The work function of the metal is $\phi = 20 \times 10 ^ { - 19 } \mathrm {~J}$. Find the frequency of the incident photon.
(A) $3.0 \times \mathbf { 1 0 } ^ { \mathbf { 1 4 } } \mathbf { ~ H z }$
(B) $3.02 \times 10 ^ { 15 } \mathrm {~Hz}$
(C) $\mathbf { 1 . 5 } \boldsymbol { \times } \mathbf { 1 0 } ^ { \mathbf { 1 5 } } \mathbf { ~ H z }$
(D) $6.6 \times \mathbf { 1 0 } ^ { \mathbf { 1 4 } } \mathbf { ~ H z }$