Approximate the kinetic energy of an electron emitted from a surface with a work function of 1.5 eV that has been illuminated with a ruby red laser at 694.3 nm. O 0.01 eV 0.1 eV 0.3 eV O 0.5 eV 0.8 eV ) 1.5 eY

Use the Bohr model to find the second longest wavelength of light in the Paschen series for a triply-ionized Be atom (Z = 4).  Recall that the Paschen series corresponds to transitions to the second excited state (n = 3). a) 13.5 nm b) 117 nm c) 73.0 nm d) 41.1 nm e) 80.2 nm

If you are shining light on a Pt electrode and no electrons are emitted, what do you have to do to generate electrons? Decrease the wavelength of the light to increase the energy of the photons to emit electrons Electrons can not be emitted from Pt because like any other noble metal it does not react, even under light exposure (unlike other metals, e.g. Na, Sr or Cu) Increase the wavelength of the light to increase the energy of the photons to emit electrons Wait longer times or increase the intensity of the light source, since the energy of the absorbed light is not high enough to emit electrons from Pt surface

Some of the most powerful lasers are based on the energy levels of                neodymium in solids, such as glass, as shown . (a) What average wavelength light can pump the neodymium into the levels above its metastable state? (b) Verify that the 1.17 eV transition produces1.06 μm radiation.

When a certain metal is illuminated by light, photoelectrons are observed, provided that the wavelength of the light is less than 669 nm. Which one of the following values is closest to the work function of this metal? O 2.2 eV 2.0 eV 1.9 eV 2.3 eV

- - - The first five energy levels of the hydrogen atom are at n 1, 13.6 eV; n = 2, 3.4 eV; n = 3, 1.51 eV; n = 4, -0.85 eV; n = 5, -0.54 eV. A hydrogen discharge lamp gives an infrared spectrum that includes a sharp line at a wavelength of 4 μm, coming from electrons excited by the discharge to a higher level, and then jump down to a lower level. Determine the energy lost by these electrons, and identify the higher and lower levels involved.