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

Which one of the following is not a property of the X-rays?

Which one of the following statements with regard to the ultraviolet light is not correct?

Which one of the following wavelengths corresponds to the wavelength of X-rays?

Which one of the following is used for determining the structure of crystal?

Which of the following rays are used in the diagnosis of intestinal diseases?