Question

Laser Wavelength	Photoelectric Effect Observed?
300 nm	Yes
525 nm	No
325 nm	Yes
425 nm	No
600 nm	No

Table 2. Select Metals and Their Binding Energies

Metal	Electron Binding Energy (J)
Cesium	3.124251e-19
Scandium	5.60763e-19
Silver	7.20981e-19
Rubidium	3.6209268e-19

1 .Which of the four elements listed is most likely to be the unknown metal?

Rubidium Silver     Scandium Cesium

2.Calculate the kinetic energy of an electron ejected from the surface of a sample of Scandium when the metal is subjected to photons having a wavelength of 325nm. Express your answer to three significant figures using scientific notation WebAssign style (1.23e+34 or 1.23e-12, for example).

J


3 Is there enough energy released from a hydrogen atom during an n = 2 to n = 1 electron transition to produce a positive photoelectric effect with Cesium whose binding energy is 1.95 eV?

Yes No     

Answer 1