i need the answers to all of t
| i need the answers to all ofthem |
(a) a greater change of energy in the atom (b) a lesser change of energy in the atom (c) none of the above |
(a) a greater change of energy in the atom (b) a lesser change of energy in the atom (c) none of the above |
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3. Fluorescent materials are noteworthy because uponde-excitation they emit visible light after being are excitedby (a) visible radiation (b) microwave radiation (c) x-rays (d) ultraviolet radiation |
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4. Assume thewavelength of a red photon isabout double that of violet light. How does the energy E of a redphoton compare with the energy of a violet photon? a) The energy is twice the energy of a violetphoton b) The energy is one half the energy of a violetphoton c) same energy |
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5. Assume the wavelength of a blue photon is about halfthat of red light. How does the energy of a blue photon comparewith the energy of a red photon? |
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a. The energy is twice the energy of a redphoton |
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b. The energy is one half the energy of a redphoton |
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c. same energy |
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6. In this problem, assume the frequency of the light isabove the threshold required to kick electrons out of the metal. Inthe photoelectric effect, the higher the wavelength of theilluminating light on the photosensitive surface, the lowerthe |
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a. number of ejected electrons |
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b. kinetic energy of ejected electrons |
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c. none of the above |
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7. One electron travels with twice the speed of another.Which has the higher wavelength? (a) the faster electron (b) the slower electron (c) wavelengths are the same |
Answer:
1) Blue light is emitted when electrons in a substance make aparticular energy – level transition. If yellow light were emittedinstead from the same substance, the light would correspond to alesser change of energy in the atom because the wavelength followsan order of VIBGYOR , that is blue has a lower wavelength ascompared to yellow light and hence lesser change of energy isrequired to produce yellow (greater wavelength) as compared to bluelight(lower wavelength).
2)
Red light is emitted when electrons in a substance make a energy– level transition. If BLUE light were emitted instead from thesame substance, the light would correspond to a greater change ofenergy in the atom because the wavelength follows an order ofVIBGYOR , that is blue has a lower wavelength as compared to redlight and hence greater change of energy is required to produceblue (smaller wavelength) as compared to red light(greaterwavelength).
3) Fluorescent materials are noteworthy because uponde-excitation they emit visible light after being are excited byultraviolet radiation which is present in excess in theatmosphere.
4) Assume the wavelength of a red photon is aboutdouble that of violet light. The energy E of a red photon comparewith the energy of a violet photon is one half.the energy of violetphoton because wavlength and energy are inversely related to eachother.
5) Assume the wavelength of a blue photon is about half that ofred light. the energy of a blue photon compared with the energy ofa red photon- The energy is twice the energy of a red photonbecause wavlength and energy are inversely related to eachother.
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