Which of the following has the highest energy?

Among the options provided, blue light has the highest energy. The correct answer is [A] Blue light. Light energy is determined by its wavelength and frequency, with shorter wavelengths corresponding to higher frequencies and higher energy photons. Blue light has a relatively shorter wavelength (around 450-495 nanometers) compared to green, red, and yellow light. The energy of a photon is directly proportional to its frequency (E = hf, where E is energy, h is Planck’s constant, and f is frequency), meaning higher frequency light like blue light carries more energy per photon. Option B, green light, has a longer wavelength and lower energy compared to blue light. Option C, red light, has an even longer wavelength and lower energy than green light. Option D, yellow light, falls between green and red in wavelength and energy. Therefore, blue light (option A) has the highest energy among the choices provided due to its shorter wavelength and higher frequency compared to the other wavelengths of light listed.