The given wavelength-energy graph shows the radiation emitted by a blackbody. Which of the following options shows the CORRECT relationship among T1, T2 and T3?
Correct answer: A. T3 > T2 > T1
- A. T3 > T2 > T1
- B. T1 > T2 > T3
- C. T2 > T1 > T3
- D. T1 > T3 > T2
Explanation
The correct answer is Option A: T3 > T2 > T1. This relationship is determined by comparing the slopes of the lines on the wavelength-energy graph. The steeper the slope, the higher the temperature. T3 has the steepest slope, followed by T2 and then T1. Therefore, T3 has the highest temperature, followed by T2 and then T1. Option B, C, and D are incorrect as they do not reflect the correct order of temperatures based on the slopes of the lines on the graph.
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Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
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