Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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The work function (φ) for a metal is the amount of energy needed to eject an electron from the surface of the metal via the
If the speed of an electron in the n = 4 energy level of a hydrogen electron is 2.3 x 106 m/s, what is the de Broglie wavelength of this electron in nanometers (the mass of an electron is 9.10938 x 10-31 kg). Note: 1 ? = 1 ?? ∙?2
An F-15 Strike Eagle weighs in at roughly 32,000 kg fully loaded. If an F-15 Eagle is traveling at 3,017 kilometers per hour, what is the de Broglie wavelength associated with the aircraft at this speed in nanometers?
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- A highly excited atom of hydrogen makes a transition from the n = 10 to the n = 9 state and emits a photon. What is the wavelength in meters of the photon emitted when this highly excited hydrogen atom of hydrogen makes its transition from the n = 10 to the n = 9 state?arrow_forwardThe energy levels the electron can occupy in the Li2+ ion can be calculated using the energy level equation. A Li2+ ion emitted a photon with a wavelength of 72.9 nm to reach an energy level with n=2. What was the value of n for its initial energy level?arrow_forwardPieces of potassium (Φ = 3.68 ×× 10–19 J) and sodium (Φ = 4.41 ×× 10–19 J) metal are exposed to radiation of wavelength 290.0 nm. Which metal emits electrons with the greater velocity? What is the velocity of the electrons from potassium? What is the velocity of the electrons from sodium?arrow_forward
- Sketch a diagram of the Bohr model of a hydrogen atom, Using arrows for excitation and relaxation of electrons. Show an electron being excited from n=1 to n=5, then relaxing down to n=2. Using the equation for difference in energy levels for a hydrogen atom and the equation for the energy of a photon, calculate wavelength (in nm) of the photon emitted when the electron relaxed from n=5 to n=2. Show all our calculations.arrow_forwardSilver has a work function, Φ, of 4.64 eV. If a sample of silver is bombarded with 213 nm photons, what will be the wavelength (in meters) of the photo-ejected electrons? (1 eV = 1.60 × 10⁻¹⁹ J, the mass of an electron is 9.109 x 10⁻³¹ kg, and Planck's constant is 6.626 x 10⁻³⁴ Js.)arrow_forwardThe photoelectric work function of a metal is the minimum energy (of a photon) needed to eject a single electron from the surface of the metal by irradiating it with a wavelength of light with that minimum energy. For potassium (K), the work function equals 3.669 x 10 19 J (per photon). a) What is the minimum frequency ( v ) of the photon of light required to eject an electron from the surface of potassium metal? [ Select ] sec- b) What is the wavelength of this photon of light? [ Select ] nm c) What part of the electromagnetic spectrum does this photon of light come from? [ Select ]arrow_forward
- How much energy (in Joules) is associated with a de Brogile wavelength of 6.80 x 10-7 meters?arrow_forwardThe minimum frequency of light needed to eject electrons from a metal is called the threshold frequency, ?0. Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 3.20×1014 s−1. With what maximum kinetic energy will electrons be ejected when this metal is exposed to light with a wavelength of 285 nm?arrow_forwardThe electron in an (unbound) hydrogen atom (H(g)) is excited from the ground state to the n=3 state.Which of the following statements are true and which are false. 1. it takes less energy to ionize the electron from n=3 than it does from the ground state.2. The wavelength of the light emitted when the electron returns to the ground state from n=3 is the same as the wavelength of light absorbed to go from n=1 to n=3.3. the electron is farther from the nucleus on average in the n=3 state than in the ground state.4. The first excited state corresponds to n=3.5. The wavelength of light emitted when the electron drops from n=3 to n=2 is shorter than the wavelength of light emitted if the electron falls from n=3 to n=1.arrow_forward
- If an electron were to move from n=4 to n=2 and produce light with a wavelength of 580 nm, what is the wavelength equivalent in meters?arrow_forwardThe electron binding energy for copper metal is 1.258 X 10−19 J. Find the longest wavelength of light in nanometers that could eject electrons from copper with a kinetic energy of 5.264 x 10 -21 Jin a photoelectric effect experiment. On your answer sheet, identify the wavelength range in which you expect to find this wavelength.arrow_forwardA silicon (Φ = 7.77 × 10-19 J) surface is irradiated with UV radiation with a wavelength of 195 nm. Assume an electron was a mass of 9.11 x 10-31 kg. What is the frequency of incident radiation? What is the speed of emitted electrons? What is the kinetic energy of emitted electrons? What is the wavelength of the emitted electrons?arrow_forward
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