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Question 10 4 pts Protons are being accelerated in a particle accelerator. If the speed of the protons is halved, the de Broglie wavelength of the protons will O decrease by a factor of 4. O decrease by a factor of 2. O increase by a factor of 4. O remain the same. O increase by a factor of 2.Question 11 4 pts If the maximum possible accuracy in measuring the position of a particle increases, the maximum possible accuracy in measuring its velocity will O O remain the same. O decrease. O increase.Question 12 4 pts What is the wavelength of a photon with energy 7.7 x 10-19 J? O 260 nm 0 310 nm 0 390 nm 0 620 nm O 350 nmQuestion 13 4 pts What is the cutoff (threshold) frequency for a metal surface that has a work function of 5.42 eV? 0 3.01 x 1015 Hz 0 2.01 x 1015 Hz 0 6.04 x 1015 Hz 0 5.02 x 1015 Hz 0 1.31 x 1015 HzQuestion 14 4 pts A material having a work function of 2.60 eV is struck by photons of wavelength 240 nm. What is the maximum kinetic energy of the emitted electrons? 0 4.27 eV 0 5.17 eV O 2.57 eV No electrons are emitted because the incident photons have insufficient energy. O 2.30 eVQuestion 15 4 pts Balmer's original formula gives the wavelength of emitted photons for electron transitions in hydrogen from energy level m to energy level n = 2. If an emitted photon has wavelength 376.86 nm, what is the value of m in Balmer's formula that gives this emission line? 0 14 0 15 0 12 0 11 0 13Question 16 4 pt In the n = 1 state, the energy of the hydrogen atom is -13.6 eV. What is its energy in the n = 3 state? 0 -6.79 eV 0 -4.53 eV 0 -1.51 eV 0 -13.76 e V O -3.40 eVQuestion 17 Is the electron configuration 1$22522p63s23p14s the ground state, an excited state, or a not allowed (impossible) state of an atom? O Excited state. . Impossible state. O Ground state.Question 18 4 pts The atomic number Z of an atom is equal to the number of what particles in the nucleus? O positrons O nucleons O electrons O protons O neutronsQuestion 19 4 pt The primary reason that very large nuclei are unstable is due to O O the attractive force between the protons and the orbiting electrons. O the extreme weakness of the gravitational attraction of the protons. O the cumulative repulsive force between the protons. the repulsive force between neutrons