The order of energy of X-ray photon is :-

Options

A. MeV
B. keV
C. eV
D. GeV

Answer

To determine the order of energy of an X-ray photon, we can follow these steps:

### Step 1: Understanding X-ray Photons
X-ray photons are high-energy electromagnetic radiation emitted when electrons transition between energy levels in an atom. When an inner-shell electron is knocked out, an outer-shell electron falls into the lower energy state, releasing energy in the form of X-rays.

**Hint:** Recall that X-rays are produced when high-energy electrons interact with matter, particularly in the context of atomic structure.

### Step 2: Energy Range of X-ray Photons
The energy of X-ray photons typically ranges from about 124 electron volts (eV) to 124 kiloelectron volts (keV). This range is significant because it defines the high-energy nature of X-rays compared to other forms of electromagnetic radiation.

**Hint:** Remember that electron volts (eV) and kiloelectron volts (keV) are units of energy, where 1 keV = 1000 eV.

### Step 3: Analyzing the Options
Given the energy range of X-ray photons, we can conclude that the energy is typically measured in kiloelectron volts (keV). Other options like megaelectron volts (MeV) or gigaelectron volts (GeV) are too high for X-ray energies.

**Hint:** Compare the energy ranges of different types of radiation to identify which units are appropriate for X-rays.

### Step 4: Conclusion
Based on the analysis, the order of energy of X-ray photons is in the range of kiloelectron volts (keV).

**Final Answer:** The order of energy of X-ray photons is in kiloelectron volts (keV).