X-rays are produced by the collision of a beam of electrons with a metal target in an x-ray tube. Called also roentgen rays. The penetrability and hardness of the x-rays increases with the voltage applied to the x-ray tube, which controls the speed with which the electrons strike the target.
Usually, when older people refer to hooking up, theyâre talking about sex, but thatâs not always true. It could also mean oral sex, kissing and feeling each other up, or just plain olâ making out. You should just decide what you want hooking up to mean to you.The next time you tell your friends what you did with a guy, go into specifics (as long as you feel comfortable), and they wonât think you did anything more than you did.sually, when older people refer to hooking up, theyâre talking about sex, but thatâs not always true. It could also mean oral sex, kissing and feeling each other up, or just plain olâ making out. You should just decide what you want hooking up to mean to you.
catch-up noun [U]. âº the âactivity of âtrying to do as well as a competitor or of âtrying to âreach a âlevel of âachievement: Having âstarted his fund-raising late, he had to âplay catch-up if he âwanted to get enough âmoney for his âpolitical âcampaign. the âprocess of âtrying to âreach the same âstandard or âquality as someone or something else when they have become more âadvanced or âsuccessful: I'm playing catch-up because of the weeks of âtraining I have missed. (Definition of catch up from the Cambridge Business English Dictionary Â© Cambridge University Press).