Which one of the following statements about X-rays is not true ?

Asked in UPSC NDA 1 2023 · Topic: Wave Motion (Electromagnetic Waves: Properties, Electromagnetic Spectrum, Energy and Momentum)

1. They have wavelengths of about 1 Å.
2. These can be generated by bombarding a metal target by high energy electrons.
3. Due to their wavelengths being shorter, these can be used for radar systems.
4. These are also used for the treatment of certain forms of cancer.

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