test z fizyki pomocy Wojciech: Witam, czy ktoś zna się na fizyce? Potrzebuję odpowiedzi na te pytania: 29.3.6. What was a surprising result of the photoelectric effect experiments? a) The electrons behaved like matter waves. b) Below a certain frequency, no electrons could be ejected from the metal surface. c) Individual photons behaved like waves. d) Above a certain light frequency, the current became zero amperes. e) Light was proven to exhibit only a wave nature. 29.3.8. In an ideally dark room, a double−slit experiment is carried out using a source that releases one photon at a time at a slow rate. The observation screen in the experiment is replaced with photographic film which provides a recording of the photons striking it over time. After some time has passed, the film is removed and developed into a photograph. What is observed on the photograph? a) two bright bands that correspond to the two slits b) an interference pattern c) a single bright band d) It’s impossible to guess. 29.4.2. An x−ray photon with an initial wavelength lambda strikes an electron that is initially at rest. Which one of the following statements best describes the wavelength of the photon after the collision? a) No photon remains after the collision. b) The scattered photon’s wavelength will still be lambda, but its frequency will decrease. c) The scattered photon’s wavelength will be longer than lambda d) The scattered photon’s wavelength will be lambda/2. e) The scattered photon’s wavelength will be between lambda/2 and lambda 29.1.2. Which one of the following experiments demonstrates the wave nature of electrons? a) Small flashes of light can be observed when electrons strike a special screen. b) Electrons directed through a double slit can produce an interference pattern. c) The Michelson−Morley experiment confirmed the existence of electrons and their nature. d) In the photoelectric effect, electrons are observed to interfere with electrons in metals. e) Electrons are observed to interact with photons (light particles).

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