UPSC CAPF (AC) 2024 Paper I · Question 3

Question 3 of the UPSC CAPF (AC) 2024 Paper I (4 August 2024). Try it first, then open the answer and explanation.

1. CAPF 2024 · P-I · Q3 · General Science · Physics

   Which one among the following has largest energy per photon?

   1. X-ray
   2. Ultra-violet ray
   3. Visible-ray
   4. Infra-red ray

   निम्नलिखित में से किसमें प्रति फ़ोटॉन सबसे अधिक ऊर्जा होती है?

   1. ऐक्स-किरण (X-ray)
   2. पराबैंगनी किरण (Ultra-violet ray)
   3. दृश्य किरण (Visible-ray)
   4. अवरक्त किरणें (Infra-red ray)
   Show answer

   Answer: (1) X-ray

   उत्तर: (1) ऐक्स-किरण (X-ray)

   The energy of a photon is E = hν = hc/λ, so the radiation with the highest frequency (shortest wavelength) carries the most energy per photon. X-rays have a much shorter wavelength than ultraviolet, visible and infrared radiation, so their photons are the most energetic.

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