Calculate the de Broglie wavelength for : a. a jogger of mass 77 kg runs with at speed of 4.1 m s1 . b. an electron of mass 9.11x10-31 kg moving at 3.25x105 m s1 (Given the Planck's constant, h =6.63x10-34J s)
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- A photon in a laboratory experiment has anenergy of 11 eV.What is the frequency of this photon?Planck’s constant is 6.63 × 10−34 J · s.Answer in units of Hz.An electron has de Broglie wavelength 2.82×10-10 m. Determine the magnitude of the electron's momentum pe. Express your answer in kilogram meters per second to three significant figures. ▸ View Available Hint(s) Pe 2.35×10-24 kg. m/s Submit Previous Answers Part B Correct Determine the kinetic energy Ke of the electron. Express your answer in joules to three significant figures. ▸ View Available Hint(s) 跖 ΑΣΦ 18 Ke=3.18 10 • Submit Previous Answers × Incorrect; Try Again; 2 attempts remaining ? JA. Electrons are ejected from a metal surface with speeds ranging up to 4.72E+5m/s when light with a wavelength of lambda = 650nm is used. What is the work function (in eV) of the surface? B. What is the cutoff frequency for this surface?
- What is the de Broglie wavelength of a particle, such as an electron, at rest? O A. Davisson and Germer measured this wavelength in their apparatus and found it to be around 10 10 m. O B. The wavelength would be infinitely small and not measurable. OC. The wavelength would be zero meters. O D. This has no meaning. The de Broglie wavelength only applies to moving particles.Electrons with a speed of 2.0 x 106 m/s pass through a double-slit apparatus. Interference fringes are detected with a fringe spacing of 1.5 mm.a. What will the fringe spacing be if the electrons are replaced by neutrons with the same speed?b. What speed must neutrons have to produce interference fringes with a fringe spacing of 1.5 mm?2. A photon has a frequency of 7.50 x 1014 Hz, a. Determine the energy and the momentum of this photon. b. If all the energy of this photon were to be converted to mass, determine the equivalent mass for the particle. c. A microscopic specimen has a wavelength of 8.2 × 10-14 m and a speed of 1.1 × 105 m/s. Determine the mass of this microscopic specimen.
- A ball has a mass of 0.216 kg just before it strikes the Earth after being dropped from a building 74.1 m tall. What is its de Broglie wavelength? The acceleration of gravity is 9.8 m/s 2 and Planck’s constant is 6.62607 × 10−34 J · s. Answer in units of m.The blackbody radiation emitted from a furnace peaks at a wavelength of 3.5 x 10-6 m (0.0000035 m). What is the temperature inside the furnace? K.Calculate the de Broglie wavelength of the following items. m₂ = 9.11 x 10-3¹ kg mp+ = 1.67 x 10-27 kg melephant = 10 tonnes a. an electron travelling at 15 km s-¹? b. an electron with a kinetic energy of 1 eV? c. a proton travelling at 15 km s-¹? d. a proton with a kinetic energy of 1 eV?