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.2983views9comments
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.1490views2comments
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?235views
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?263views
Open QuestionThe binding energy of electrons in a metal is 193 kJ/mol. What is the threshold frequency of the metal?
Open QuestionAssuming total absorption of the light by the sample, what is the maximum amount (in moles) of CH3X that breaks apart when a cuvette containing a solution of CH3X is irradiated with 280-nm light with a power of 885 mW for 10.0 minutes, given that the quantum yield for the reaction CH3X → CH3 + X is f = 0.24?
Open QuestionA student is studying the photodissociation (dissociation with light) of I2 into 2I. When a sample of I2 is irradiated with a power of 255 mW at 590 nm for 35 seconds, 0.0256 mmol of I forms. Assuming complete absorption of the incident radiation, what is the quantum yield, f, of the reaction? (See Problem 93 for definition of quantum yield.)
01:26
