x-Ray

In the production of X-rays, it is possible to create Bremsstrahlung X-rays without producing the characteristic X-rays. Explain how this can be accomplished by adjusting the electric potential difference used to operate the X-ray tube.

Which of the following pairs constitute very similar rediations? (i) Hard ultraviolet rays and soft X-rays (ii) Soft ultraviolet rays and hard X-rays (iii) Very hard X-rays and low-frequency gamma -rays (iv) Soft X-rays and gamma -rays