Which one among the following has largest energy per photon ?

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Which one among the following has largest energy per photon ?

X-ray
Ultra-violet ray
Visible-ray
Infra-red ray
This question was previously asked in
UPSC CAPF – 2024
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The energy of a photon is directly proportional to its frequency. In the electromagnetic spectrum, energy increases as frequency increases and wavelength decreases. Among the given options, X-rays have the highest frequency (and shortest wavelength), followed by Ultra-violet rays, Visible rays, and Infra-red rays.
– The relationship between photon energy (E), Planck’s constant (h), frequency (f), speed of light (c), and wavelength (λ) is given by E = hf = hc/λ.
– Higher frequency or shorter wavelength corresponds to higher photon energy.
– The order of electromagnetic radiation in increasing frequency (and thus increasing energy per photon) is: Radio, Microwave, Infrared, Visible, Ultraviolet, X-ray, Gamma ray.
Visible light occupies a small portion of the spectrum. Infrared is below visible light in frequency, and Ultraviolet, X-rays, and Gamma rays are above visible light in frequency. X-rays are high-energy electromagnetic radiation capable of penetrating various materials, widely used in medical imaging and security screening.

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