In a photoelectric experiment it is found that a stopping potential of 1.00 V is needed to stop all the electrons when incident light of wavelength 260 nm is used and 2.30 V is needed for light of wavelength 207 nm. From these data determine Planck’s constant and the work function of the metal.
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In a photoelectric experiment it is found that a stopping potential of 1.00 V is needed to stop all the electrons when incident light of wavelength 260 nm is used and 2.30 V is needed for light of wavelength 207 nm. From these data determine Planck’s constant and the work function of the metal.
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- 1.4 A radiation with a frequency of 3.13 x10¹5 Hz releases an electron from a copper plate. The kinetic energy of the electron is 2.00 x10-¹7 J. NB: Planck's constant, h = 6.63 x 10-34 Js. (1) (ii) Calculate the work function of the plate. Calculate the energy of a photon with a frequency of 5.4 x 10¹4 Hz. 1.5 The intensity of x-ray beam passing through a material decreases exponentially. 1)Light of frequency 12x1015 Hz shines on to clean caesium metal. What is the maximum kinetic energy of the electrons emitted ? The work function of caesium is 1.5 x 10-19 J and the Planck constant h = 6.63 x 10-34 J s. Round off the answer to 2 decimal places and write answers as power of 10.Radiation of frequency 8 x 10" Hz is incident on a metal. The maximum Kinetic energy of photoelectrons emitted is 1.5 × 10 ¹9 J. Find the maximum Kinetic energy of photoelectrons emitted when radiation of wavelength 4500 A is incident on the metal and corresponding stopping potential. (Charge on electron = 1.6 × 10-19 C).
- Lithium has a work function of 2.51 eV. What is the maximum kinetic energy of the photoelectrons if 9.7 x 10¹4 Hz radiation is incident upon it?The work function of caesium metal is 2.14 eV. When light of frequency 6 x 1014 Hz is incident on the metal surface, photoemission of electrons occurs. What is the maximum kinetic energy of the emitted electrons,If all the energy from a 93 W light bulb is emitted, on average, at 530.0 nm, how many 530.0 nm photons must be emitted each second to account for all 93 W? Planck's constant is 6.6 x 1034 J*s and the speed of light is 3.0 x 10° m/s.
- In an experiment to study the photo-electric effect, light of wavelength 400 nm shining on a metallic surface causes electrons to be emitted. The maximum kinetic energy of the electrons is 1.05 eV (electron volts). Another light source of wavelength 200 nm is then tried, and the emitted electrons have a maximum kinetic energy of 4.20 eV. Using this information: a) determine the value of Planck's constant. b) determine the work function of the metal.A nickel crystal’s work function is measured to be 5.22 eV at 25°C. As the temperature increases by 300°C, the work function drops by 50 meV. By how much does this shift the threshold wavelength for photoelectric emission?No photoelectrons are emitted from tungsten unless the wavelength of incoming light is less than 270 nm. If an experiment requires electrons with a maximum kinetic energy of 2.0 eV, what frequency of light should be used to illuminate the tungsten?