Which of the following electro magnetic waves are used in telecommunication?
1) X rays
2)Infrared
3)Microwaves
4)Ultraviolet rays

Which of the following wavelength falls in X - ray region

Which of the following does not characterise X-rays?

Which of the following is/are not true for x- rays?

Which of the following statements are correct for an X-ray tube?

Which of the following statements are correct for an X-ray tube?

Which of the following is incorrect regarding ultraviolet rays?

Which of the following processes causes the emission of X-ray?

Which rays are not the portion of electro-magnetic spectrum?

Which of the following are not electromagnetic waves? (i) alpha -rays (ii) Radio waves (iii) beta -rays (iv) Sound waves (v) Micro waves (vi) Cosmic rays

Which of the following electromagnetic waves has (a) minimum wavelength, and (b) minimum frequency? Write one use of each of these two waves. Infrared waves, Microwaves, gamma and X-rays.