Which one of the following types of waves are used in a Night vision apparatus?

Which of the following rays/waves are used to know the growth of fetus in the womb?

Which one of the following types of radiation has the shortest wavelength?

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

Which one of the following types of radiations has the smallest wavelength ?

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