Find the maximum frequency, the X-ray emitted by an X-ray tube operating at `30 kV`

Explanation

To find the maximum frequency of the X-ray emitted by an X-ray tube operating at 30 kV, we can follow these steps:

### Step 1: Understand the relationship between energy and frequency
The energy (E) of an X-ray photon is related to its frequency (f) by the equation:
\[ E = h \cdot f \]
where \( h \) is Planck's constant.

### Step 2: Relate the energy to the voltage
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