Multiple ChoiceA metal with a threshold frequency of 2.15 x 1015 s-1 emits an electron with a velocity of 7.03 x 106 m/s when radiation of 4.88 x 1015 s-1 strikes the metal's surface. Calculate the mass of the electron.2841views9comments
Multiple ChoiceAn ultraviolet photon with a wavelength of 320 nm strikes a metal surface. The emitted electron has a kinetic energy of 3.0 x 10-2 eV. What is the binding energy of the electron in kJ/mol? 1 electron volt (eV) = 1.602 x 10-19 J.1394views2comments
Open QuestionWhat is the threshold frequency for sodium metal if a photon with frequency 6.66 × 1014 s−1 ejects an electron with 7.74 × 10−20 J kinetic energy? Will the photoelectric effect be observed if sodium is exposed to orange light?176views
Open QuestionA ray of red light has a wavelength of about 7.00×10−7 m. Will exposure to red light cause electrons to be emitted from cesium?196views
Open QuestionWhen an object like a piece of graphite is heated to 1000 K, it glows red. When the temperature is increased to around 3000 K, the color of emitted light becomes orange. What is the reason for this change in color?a. The speed of the photons (quantized packets of radiant energy) increases with increasing temperature.b. The average wavelength of the photons emitted increases with increasing temperature.c. The average energy of the photons emitted increases as the temperature increases.
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