Problem 13: The life time of an electron is an excited state is about 10-8 s. What is its uncertainty in energy during this time?…

Problem 12: The speed of an electron is measured to be 5 × 103 m/s to an accuracy of 0.003%. Find the uncertainty in determining…

Problem 11: An electron is accelerated through a potential difference of 50 V. Calculate its de Broglie wavelength. Solution Given: Applied potential difference, V =…

Problem 10: Calculate the wavelength of the de Broglie waves associated with electrons accelerated through a potential difference of 200 V. Solution De Broglie hypothesis…

Problem 9: A 50 keV X-rays is scattered through an angle of 900. What is the energy of the X-rays after Compton Effect? Solution Given…

Problem 8: The thermal radiations from the sun peaks in the visible part of the spectrum. Estimate the temperature of the sun. Solution Theory: When…

Problem 7: A metal whose work function is 3.0 eV is illuminated by light of wavelength 3 × 10-7 m. Calculate (1) The threshold frequency…

Problem 6: At what fraction of speed of light must a particle move so that its K.E is one and a half times the rest…

Problem 5: The rest mass of proton is 1.673 × 10-27 kg. At what speed would the mass of proton would be tripled? Solution Explanation:…

Problem 4: An electron moves with a speed of v = 0.85 c. Find its total energy and K.E in electron volts. Solution Explanation: When…