A photoelectric experiment is performed by separately shining a laser at 450 nm (blue light) and...
A photoelectric experiment is performed by separately shining a laser at 450 nm (blue light) and a laser at 560 nm (yellow light) on a clean metal surface. Assume that each laser is above the threshold frequency and delivers the same number of photons per second.
Which laser will eject electrons with shorter de Broglie wavelength?
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A photoelectric experiment is performed by separately shining a
laser at 450 nm (blue light) and...
In the photoelectric effect experiment, a beam of light is shining on a metal surface and the electrons are emitted from the metal. One of the three key findings is that a minimum frequency of lig...
In the photoelectric effect experiment, a beam of light is shining on a metal surface and the electrons are emitted from the metal. One of the three key findings is that a minimum frequency of light is required for emission of electrons. This minimum frequency is found to be 5.5 × 1014 s-1 for an unknown metal. 4 Briefly describe the other two findings and draw a plot fo the KE of emitted electrons against light frequency. (a) (6 marks)...
Which of the following statements is correct for photoelectric effect? (A) In order to eject electrons...
Which of the following statements is correct for photoelectric effect? (A) In order to eject electrons from a metal surface, the wavelength of photon must be shorter than the threshold wavelength. (B) In order to eject electrons from a metal surface, the frequency of photon must be lower than the cut-off frequency. (C) The work function increases with increasing the frequency of photons. (D) The work function increases with increasing the wavelength of photons. (E) The kinetic energy of ejected...
In an experiment to test the photoelectric effect, Divya shines a 450 nm blue laser at...
In an experiment to test the photoelectric effect, Divya shines a 450 nm blue laser at a sodium target. This produces a current I in a circuit she is using to detect the electrons emitted. Which of the following changes in her experimental setup would double the current in the circuit to 2I ? (The work function of sodium is approximately 2.36 eV.) Double the intensity of the 450 nm blue laser. Replace the laser with a 900 nm infrared...
The photoelectric effect is observed by shining blue monochromatic light having wavelength 450 nm onto a...
The photoelectric effect is observed by shining blue monochromatic light having wavelength 450 nm onto a sample of caesium. The collector electrode is biased to a voltage V relative to the caesium potential (a) Use the Internet to look up the workfunction of caesium (b) Find the most negative value of V, the retarding potential, at which a photocurrent may be observed (c) What is the longest wavelength of radiation that would allow photocurrent from the caesium to be observed...
In an experiment searching for the photoelectric effect, an incident beam of green light produced no...
In an experiment searching for the photoelectric effect, an incident beam of green light produced no ejected electrons from a metal. In order to eject electrons, the experimenter should? A. increase the brightness of the light. B. try blue light. C. try yellow light. D. give up on that particular metal. E. decrease the brightness of the light.
When ultraviolet light with a wavelength of 280 nm is incident on a particular metal surface,...
When ultraviolet light with a wavelength of 280 nm is incident on a particular metal surface, electrons are emitted via the photoelectric effect. The maximum kinetic energy of these electrons is 1.44 eV. (a) What is the work function of the metal? eV (b) What is the threshold frequency for this particular metal? Hz
(1 point) A Silver surface (work function = 4.26 eV) is illuminated with 270 nm light...
(1 point) A Silver surface (work function = 4.26 eV) is illuminated with 270 nm light from a 3 mW laser. How many photons per second are emitted by the laser? 4.0909E15 photons/s Only a small fraction of these photons can interact with electrons at the surface. Suppose this fractional efficiency is 0.00031%. What is the current in the detector assuming all the emitted electrons are captured? пA Note that current is charge(in Coulombs) per second. The charge of one...
1.(16 pts) (1) In a photoelectric experiment, Molybdenum must absorb radiation having a frequency of 1.09...
1.(16 pts) (1) In a photoelectric experiment, Molybdenum must absorb radiation having a frequency of 1.09 x 1015 1/s before it can eject an electron from the surface of the metal. Calculate the work function of Molydenum in Joules. (ii) What is the wavelength, in nm, of the photon associated with the work function? (iii) If molybdenum is irradiated with light of wavelength 120 nm, what is the maximum kinetic energy, in Joules, of the electron emitted? Recall the Einstein...
1.(16 pts) (i) In a photoelectric experiment, Molybdenum must absorb radiation having a frequency of 1.09...
1.(16 pts) (i) In a photoelectric experiment, Molybdenum must absorb radiation having a frequency of 1.09 x105 1/s before it can eject an electron from the surface of the metal. Calculate the work function of Molydenum in Joules (ii) What is the wavelength, in nm, of the photon associated with the work function? (iii) If molybdenum is irradiated with light of wavelength 120 nm, what is the maximum kinetic energy, in Joules, of the electron emitted? Recall the Einstein equation...
7 (a)* The Planck constant h can be measured in an experiment using light-emitting diodes LEDs) Each LED used i...
7 (a)* The Planck constant h can be measured in an experiment using light-emitting diodes LEDs) Each LED used in the experiment emits monochromatic light. Te wavelength λ of the emitted photons is detemined during the manufacturing process and is provided by the manufacturer When the p.d. across the LED reaches a specific minimum value suddenly switches on emitting photons of light of wavelength the LED andi are related by the energy equation eVi hh flying lead Fig. 7.1 LED...
In the photoelectric effect experiment, a beam of light is shining on a metal surface and the electrons are emitted from the metal. One of the three key findings is that a minimum frequency of light is required for emission of electrons. This minimum frequency is found to be 5.5 × 1014 s-1 for an unknown metal. 4 Briefly describe the other two findings and draw a plot fo the KE of emitted electrons against light frequency. (a) (6 marks)...
The photoelectric effect is observed by shining blue monochromatic light having wavelength 450 nm onto a sample of caesium. The collector electrode is biased to a voltage V relative to the caesium potential (a) Use the Internet to look up the workfunction of caesium (b) Find the most negative value of V, the retarding potential, at which a photocurrent may be observed (c) What is the longest wavelength of radiation that would allow photocurrent from the caesium to be observed...
When ultraviolet light with a wavelength of 280 nm is incident on a particular metal surface, electrons are emitted via the photoelectric effect. The maximum kinetic energy of these electrons is 1.44 eV. (a) What is the work function of the metal? eV (b) What is the threshold frequency for this particular metal? Hz
(1 point) A Silver surface (work function = 4.26 eV) is illuminated with 270 nm light from a 3 mW laser. How many photons per second are emitted by the laser? 4.0909E15 photons/s Only a small fraction of these photons can interact with electrons at the surface. Suppose this fractional efficiency is 0.00031%. What is the current in the detector assuming all the emitted electrons are captured? пA Note that current is charge(in Coulombs) per second. The charge of one...
1.(16 pts) (1) In a photoelectric experiment, Molybdenum must absorb radiation having a frequency of 1.09 x 1015 1/s before it can eject an electron from the surface of the metal. Calculate the work function of Molydenum in Joules. (ii) What is the wavelength, in nm, of the photon associated with the work function? (iii) If molybdenum is irradiated with light of wavelength 120 nm, what is the maximum kinetic energy, in Joules, of the electron emitted? Recall the Einstein...
1.(16 pts) (i) In a photoelectric experiment, Molybdenum must absorb radiation having a frequency of 1.09 x105 1/s before it can eject an electron from the surface of the metal. Calculate the work function of Molydenum in Joules (ii) What is the wavelength, in nm, of the photon associated with the work function? (iii) If molybdenum is irradiated with light of wavelength 120 nm, what is the maximum kinetic energy, in Joules, of the electron emitted? Recall the Einstein equation...
7 (a)* The Planck constant h can be measured in an experiment using light-emitting diodes LEDs) Each LED used in the experiment emits monochromatic light. Te wavelength λ of the emitted photons is detemined during the manufacturing process and is provided by the manufacturer When the p.d. across the LED reaches a specific minimum value suddenly switches on emitting photons of light of wavelength the LED andi are related by the energy equation eVi hh flying lead Fig. 7.1 LED...
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