AP Chemistry
3.12 Properties of Photons
3.11 Spectroscopy and the Electromagnetic Spectrum
A student investigates the photoelectric effect on a clean plate of calcium metal placed in an evacuated chamber. The threshold frequency (\(\nu_0\)) required to eject an electron from the surface of the calcium metal is determined to be \(7.0 \times 10^{14} \text{ s}^{-1}\). The student shines four different monochromatic light sources, one at a time, onto the calcium plate. The properties of each light source are shown in the table below.
Which of the following correctly identifies all the light source(s) capable of ejecting photoelectrons from the calcium metal, and provides the correct justification?
| Light Source | Wavelength (\(\text{nm}\)) | Beam Intensity (\(\text{W}\)) |
|---|---|---|
| 1 | \(300\) | \(0.05\) |
| 2 | \(400\) | \(0.10\) |
| 3 | \(600\) | \(1.50\) |
| 4 | \(750\) | \(3.00\) |
Which of the following correctly identifies all the light source(s) capable of ejecting photoelectrons from the calcium metal, and provides the correct justification?
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