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CE Predict/Explain A source of red light has a
Chapter 30, Problem 12P(choose chapter or problem)
Problem 12P
CE Predict/Explain A source of red light has a higher-wattage than a source of green light. (a) Is the energy of photons emitted by the red source greater than, less than, or equal to the energy of photons emitted by the green source? (b) Choose the best explanation from among the following:
I. The photons emitted by the red source have the greater energy because that source has the greater wattage.
II. The red-source photons have less energy than the green-source photons because they have a lower frequency. The wattage of the source doesn’t matter.
III. Photons from the red source have a lower frequency, but that source also has a greater wattage. The two effects cancel, so the photons have equal energy.
Questions & Answers
QUESTION:
Problem 12P
CE Predict/Explain A source of red light has a higher-wattage than a source of green light. (a) Is the energy of photons emitted by the red source greater than, less than, or equal to the energy of photons emitted by the green source? (b) Choose the best explanation from among the following:
I. The photons emitted by the red source have the greater energy because that source has the greater wattage.
II. The red-source photons have less energy than the green-source photons because they have a lower frequency. The wattage of the source doesn’t matter.
III. Photons from the red source have a lower frequency, but that source also has a greater wattage. The two effects cancel, so the photons have equal energy.
ANSWER:
Step 1 of 2:-
a)
Here, we have to explain whether the energy of the red source is greater than, less than or equal to the energy of green source of light.
Both source have same wattage means same power.
The energy of photons is directly proportional to the frequency of the light. As the frequency of green light is much higher than red light, the energy of photons from green source is higher.