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HomeWork PHY240: Particle Properties of Light

HomeWork PHY240: Particle Properties of Light. September 28, 2010 Due October 6, 2010. PHY240 PHYIII: Chp3 Particle Properties of Waves. Question #1 Planck constant ( i ) is a universal constant (ii) is the same for all metals (iii) is different for different metals

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HomeWork PHY240: Particle Properties of Light

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  1. HomeWork PHY240: Particle Properties of Light September 28, 2010 Due October 6, 2010

  2. PHY240 PHYIII: Chp3 Particle Properties of Waves • Question #1 • Planck constant • (i) is a universal constant • (ii) is the same for all metals • (iii) is different for different metals • (iv) characterises the quantum scale • A. I,IV B. I,II, IV C. I, III,IV • D. I, III E. II,III

  3. PHY240 PHY III Chp2 • Question #2 • (a) Lithium, beryllium and mercury have work functions of 2.3 eV, 3.9 eV and 4.5 eV, respectively. If a 400-nm light is incident on each of these metals, determine • (i) which metals exhibit the photoelectric effect, and • (ii) the maximum kinetic energy for the photoelectron in each case (in eV)

  4. Phy240 PHY III Question # 3 • (b) Molybdenum has a work function of 4.2 eV. • (i) Find the cut-off wavelength (in nm) and threshold frequency for the photoelectric effect. • (ii) Calculate the stopping potential if the incident radiation has a wavelength of 180 nm.

  5. PHY240 PHY III Question #4 • Light of wavelength 400 nm is incident upon lithium (W0 = 2.9 eV). Calculate • (a) the photon energy and • (b) the stopping potential, Vs • (c) What frequency of light is needed to produce electrons of kinetic energy 3 eV from illumination of lithium?

  6. Phy240 PHY III Question #5 Which of the following statement(s) is (are) true? • I The energy of the quantum of light is proportional to the frequency of the wave model of light • II In photoelectricity, the photoelectrons has as much energy as the quantum of light which causes it to be ejected • III In photoelectricity, no time delay in the emission of photoelectrons would be expected in the quantum theory • Murugeshan, S. Chand & Company, New Delhi, pg. 136, Q28 (for I), Q29, Q30 (for II,III)

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