30. When we look at sub-atomic particles like neutrons, protons and electrons, we most often talk about the wave nature

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30 When We Look At Sub Atomic Particles Like Neutrons Protons And Electrons We Most Often Talk About The Wave Nature 1 (79.44 KiB) Viewed 26 times

30. When we look at sub-atomic particles like neutrons, protons and electrons, we most often talk about the wave nature of electrons. It seems they display more wavelike properties than the other two. Why is this? a) Neutrons, which have no electric charge, don't exhibit any wavelike properties b) The electron wave has a much longer wavelength because neutrons and protons are so much more massive than electrons c) Particles which live inside the nucleus don't have wavelike behavior d) Protons, because of their positive charge, have a very small wave e) Electrons, which are so much more massive than protons and neutrons, have a much bigger associated wave 31. Can you calculate the mass of a photon? A photon is a particle of light. Let's suppose you have two photons, one is a photon of infra-red (ir) light with wavelength of 800 nm (=0.0000004 m). The other is a photon of ultraviolet (uv) light with wavelength of 400 nm. Concerning the mass of these photons, which of the following is true? a) The uv photon is twice as massive as the ir one b) The ir photon is twice as massive as the uv one c) They are equally massive, since light doesn't have mass d) The uv photon is four times as massive as the ir one e) The ir photon is four times as massive as the uv one 32. When you sunbathe your skin feels warm due to sunlight falling on it and it also suffers some permanent damage. Interestingly much of the warmth we feel comes from the infra-red radiation in the sunlight, whereas almost all the damage done is done by all the ultraviolet radiation in the sunlight. Why is it that the ultraviolet light does the damage even though it is a small part of the total energy reaching you? a) We are mostly transparent to infra-red photons b) The redshift effect makes the infra-red photons all but disappear c) There aren't so many infra-red photons reaching us, but they each contain more energy d) The ultra-violet light has more photons reaching us, but many of them pass right through us like X-rays There are many more photons of infra-red light falling, but each one has too little energy to damage our skin