A type of electromagnetic wave has wavelength 50 Å.
State one use of this type of wave.

Explanation

To solve the question regarding the electromagnetic wave with a wavelength of 50 Å, we can follow these steps:

### Step 1: Identify the Type of Electromagnetic Wave
- The wavelength given is 50 Å (angstroms), which is equivalent to \(50 \times 10^{-10}\) meters.
- X-rays are known to have wavelengths in the range of 0.1 Å to 100 Å.

### Step 2: Confirm the Classification
- Since 50 Å falls within the X-ray wavelength range, we can classify the wave as an X-ray.
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