85. Compton's X-ray experiment showed that 81. The work function is equivalent to the energy needed to free the most weakly bound only photons behave like particles only electrons behave like particles 81. momentum and kinetic energy are conserved when photons collide with electrons momentum and kinetic energy are lost when photons collide with electrons 82. The photoelectric effect is the emission of electrons by certain metals when they are exposed 85. to mulubrog 82. 86. Determine the frequency and wavelength of a photon emitted when an excited electron drops from E3 to E2 in a hydrogen atom. 83. According to Planck's hypothesis, the energy of an incandescent body is quantized the variable n can have any real number value the frequency of vibration is inversely proportional to the energy atoms constantly radiate electromagnetic waves when they vibrate 86. 84. If the incident light on a photocell is very dim, electrons will For #87 and #88, write true or rewrite the italicized part to make the statement true. never be ejected 87. When an electron moves from the ground state to an excited state, it absorbs energy. 1 01.010 diane always be ejected be ejected immediately if the frequency is at or above the threshold frequency be ejected after a long time if the threshold is below the threshold frequency 88. In his gold-foil experiment, Rutherford directed B-particles at the gold-foil target