Which one of the following statements about X-rays is not true ?
- A.They have wavelengths of about 1 Å.
- B.These can be generated by bombarding a metal target by high energy electrons.
- C.Due to their wavelengths being shorter, these can be used for radar systems.
- D.These are also used for the treatment of certain forms of cancer.
Show answer
X-rays are not used in radar; radar works with microwaves, which have wavelengths of a few centimetres. X-rays lie between ultraviolet rays and gamma rays in the electromagnetic spectrum, with wavelengths from about 10 nm down to 0.01 nm, so about 1 Å (0.1 nm) is typical.
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