Heisenberg’s uncertainty principle tells us that some properties of a particle cannot be measured simultaneously with exact precision. Which ones? Explain.
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Heisenberg’s uncertainty principle tells us that some properties of a particle cannot be measured simultaneously with exact precision. Which ones? Explain.
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- 2. A particle of matter is moving with a kinetic energy of 6.55 eV. Its de Broglie wavelength is 1.34 x 10^-12 m. What is the mass of the particle? 4.68E-26 kg 1.40E-25 kg 1.99E-25 kg 1.17E-25 kg124. For a 1-kg ball in a l-m² square two-dimensional box (i.e., L = 1 m), what is the lowest quantum energy allowed? If the ball had this kinetic energy, how long would it take to travel from one side of the box to the other? Is this time something that you think you could measure?In the series of hydrogen; a) What value of n is associated with the 550-nm spectral line? b) Could this wavelength be associated with the Paschen series or the Balmer 16 series? c) Find the shortest wavelength of the radiation emitted with the Lyman series?
- According to de Broglie's hypothesis, the wavelength of a moving particle is a) directly proportional to the energy of the particle. b) directly proportional to the momentum of the particle. c) inversely proportional to the energy of the particle. d ) inversely proportional to the momentum of the particle= 1. Photoelectric effect. In a photoelectric experiment in which monochromatic light of wave- length \ falls on a potassium surface, it is found that the stopping potential Vstop is 1.9 V for > 300 nm and 0.88 V for \ = 400 nm. Imagine we know neither Planck's constant, nor the workfunction for potassium, nor the threshold frequency fo. But assume we do know the elementary charge e 1.60 × 10-19 C and want to test the theoretical prediction of Eintsein's theory. = (a) From the given data, calculate a value for Planck's constant, h. (b) From the same data, find the workfunction Eo and the threshold frequency fo for potas- sium. (c) Then compare your results for h and Eo to their known values (see Knight, Table 38.1 for the work function). (d) Plot eVstop as a linear function of frequency f. Include the information you have found in parts (a) and (b) as well as the experimental data.