
Practice Exercise. What must the kinetic energy of a helium atom with a mass of 6.65...
The kinetic energy of the electron in a ground state hydrogen atom is 2.2 × 10-18 J. a) Determine the momentum of the electron if the electron mass me = 9.1 × 10-31 kg. b) Calculate the de Broglie wavelength of this electron.
A gas of helium atoms (each of mass 6.65×10−27kg) is at room temperature of 7.1°C. What is the de Broglie wavelength of the helium atoms that are moving at the root-mean-square speed?
What is the de Broglie wavelength of a He atom with a kinetic energy of 0.025 eV? What is the de Broglie wavelength of an electron with the same kinetic energy?
Alpha particles have a mass of mα=6.64×10−27 kg.mα=6.64×10−27 kg. Calculate the de Broglie wavelength λ1λ1 of an alpha particle that has a kinetic energy of K1=1.90×10−13 J.K1=1.90×10−13 J. λ1=λ1= m m Calculate the de Broglie wavelength λ2λ2 of an alpha particle that has a kinetic energy of K2=5.00×10−13 J.K2=5.00×10−13 J. λ2=λ2=
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9) Calculate the kinetic energy in eV) of a nonrelativistic neutron that has a de Broglie wavelength of 9.9 * 10-12 m. (h-6.626 x 10-34 J·s, mneutron - 1.675 x 10-27 kg, 1 eV = 1.60 10-191)
Calculate the de Broglie wavelength in meters of a tennis ball with a mass of 9.00 x 102 kg that has a kinetic energy of 6.53 x 107 J. (Answer. 1.93 x 10-7 m)
What must be the kinetic energy of an electron if the ratio of its de Broglie wavelength to its Compton wavelength is 10^-3?
12. What is the average kinetic energy per molecule of a diaatomic gas at 10°c? 13. What is the rms speed of the molecules of helium gas at 25°C. Helium is a monoatomic gas Mass of He atom 6.65 x 1027Kg
2. Consider a sample of helium gas at room temperature. (a) What is the average kinetic energy of an atom of helium in the gas sample? (b) What is the rms speed for the atoms? 3. A beaker with negligible mass contains 0.50 kg of water at a temperature of 800 C. How many grams of ice at a temperature of -20° C must be dropped in the waters temperature of the system is 30° C? (Cice 2010J/(kg C), Cwater...
Alpha particles have a mass of mα=6.64×10−27 kg.mα=6.64×10−27 kg. Calculate the de Broglie wavelength λ1λ1 of an alpha particle that has a kinetic energy of K1=1.30×10−13 J.