A horizontal cesium plate (work function = 1.9 eV) is moved vertically downward at a constant speed V in a room full of radiation of wavelength 250 nm and above. The minimum value of v so that the vertically upward component of velocity is no positive for each photoelectron.

\[2.03\times {{10}^{7}}m{{s}^{-1}}\]

\[1.04\times {{10}^{6}}m{{s}^{-1}}\]

\[4.03\times {{10}^{8}}m{{s}^{-1}}\]

\[5.11\times {{10}^{9}}m{{s}^{-1}}\]

A horizontal cesium plate (work function = 1.9 eV) is moved vertically

1.	A horizontal cesium plate (work function = 1.9 eV) is moved vertically downward at a constant speed V in a room full of radiation of wavelength 250 nm and above. The minimum value of v so that the vertically upward component of velocity is no positive for each photoelectron.
A.	\[1.04\times {{10}^{6}}m{{s}^{-1}}\]
B.	\[2.03\times {{10}^{7}}m{{s}^{-1}}\]
C.	\[4.03\times {{10}^{8}}m{{s}^{-1}}\]
D.	\[5.11\times {{10}^{9}}m{{s}^{-1}}\]
Answer» B. \[2.03\times {{10}^{7}}m{{s}^{-1}}\]