1. How will you relate energy of emitted photon with its
frequency and wavelength?
6. e/m value for positive rays is the maximum for
hydrogen gas. Why?
2. Calculate mass of electron from charge to mass ratio
electron?
7. What is origin of hydrogen spectrum?
3. Cathode rays are material particles. Explain with
example.
8. Justify that the distance between different orbits go
on increasing from the lower to the higher orbits .
4. Write two reactions of slow and fast neutrons? 9. What are degenerate orbitals?
5. Why electron near nucleus move faster? 10. Why energy difference decreases sharply between
adjacent orbits moving towards higher orbits?
Answers
Answer:
Photon energy is the energy carried by a single photon. The amount of energy is directly proportional to the photon's electromagnetic frequency and thus, equivalently, is inversely proportional to the wavelength. The higher the photon's frequency, the higher its energy. Equivalently, the longer the photon's wavelength, the lower its energy.
Photon energy can be expressed using any unit of energy. Among the units commonly used to denote photon energy are the electronvolt (eV) and the joule (as well as its multiples, such as the microjoule). As one joule equals 6.24 × 1018 eV, the larger units may be more useful in denoting the energy of photons with higher frequency and higher energy, such as gamma rays, as opposed to lower energy photons, such as those in the radio frequency region of the electromagnetic spectrum.