- 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.
Which one among the following has largest energy per photon ?
Asked in UPSC CAPF 2024 · Topic: Optics (Wave Nature of Light: Huygens' Principle)
More Physics questions
- Light waves are
- The quanta of light is called
- The emission spectrum of hydrogen discovered first and the region of the electromagnetic spectrum in which it belongs, respectively are
- Arrange the following electromagnetic radiations in decreasing order of their frequencies. 1. Gamma rays 2. Ultraviolet rays 3. Radio waves 4. X-rays Select the correct answer from the code given below : Code :
- A photon will have less energy, if its
- The work function for a metal is 4 eV. To emit a photo electron of zero velocity from the surface of this metal, the wavelength of the incident radiation should be
- The work function for a metal is 4 eV. To emit a photo electron of zero velocity from the surface of this metal, the wavelength of the incident radiation should be - (a) 2700 $\AA$ - (b) 1700 $\AA$ - (c) 5900 $\AA$ - (d) 3108 $ \AA$
- A cup of tea is placed at a table, and the room temperature is 35°C. The tea cools from 90°C to 70°C in 5 minutes. Which one among the following is the correct time taken for the tea to cool from 70°C to 50°C ?