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UPSC 2009: Which one among the following has the highest energy ?
(a)Blue light
(b)Green light
(c)Red light
(d)Yellow light
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Not attemptedCorrect Answer: (a) Blue light
Photon energy is directly proportional to frequency (E = h f). Within the visible band, blue light (~450 nm, ≈6.6 × 10¹⁴ Hz) has a higher frequency and therefore more energy than green, yellow or red light, making blue the highest-energy option given. ([britannica.com](https://www.britannica.com/science/color/The-visible-spectrum?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2009 Science & Technology question?▼
The correct answer is option (a): Blue light. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Physics question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2009, GS Paper 1, as Question 118. It falls under Science & Technology > Physics.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Physics?▼
UPSC has asked 104 questions from Physics (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.