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Ultra violet release electrons from zinc plate leaving it positively charged. These positive charge neutralizes the electrons on the electroscope.
johnmulu answered the question on February 20, 2017 at 10:09
- The anode of an x-ray tube becomes hot when the tube is in use. State the reason for this.(Solved)
The anode of an x-ray tube becomes hot when the tube is in use. State the reason for this.
Date posted: February 20, 2017. Answers (1)
- An x-ray tube produces soft x-rays. State the adjustment that may be made so that the tube produces hard x-rays(Solved)
An x-ray tube produces soft x-rays. State the adjustment that may be made so that the tube produces hard x-rays
Date posted: February 20, 2017. Answers (1)
- An x-ray tube produces soft x-rays. State the adjustment that may be made so that the tube produces hard x-rays.(Solved)
An x-ray tube produces soft x-rays. State the adjustment that may be made so that the tube produces hard x-rays.
Date posted: February 20, 2017. Answers (1)
- In an X-ray tube it is observed that the intensity of X-rays increases when potential difference across the filament is increased.(Solved)
In an X-ray tube it is observed that the intensity of X-rays increases when potential difference across the filament is increased. Explain this observation
Date posted: February 20, 2017. Answers (1)
- The accelerating potential of a certain X-ray tube is increased. State the change observed on the X-rays produced.(Solved)
The accelerating potential of a certain X-ray tube is increased. State the change observed on the X-rays produced.
Date posted: February 20, 2017. Answers (1)
- State the reason and the effect on the X-rays produced in an X-ray tube, when the p.d across the tube is increased. (Solved)
State the reason the effect on the X-rays produced in an X-ray tube, when the p.d across the tube is increased.
Date posted: February 20, 2017. Answers (1)
- The target of X-ray tube is made of metals of high melting point,give reason(Solved)
The target of X-ray tube is made of metals of high melting point. Give a reason for this
Date posted: February 20, 2017. Answers (1)
- State the differences between hard X-ray and soft X-rays(Solved)
State the differences between hard X-ray and soft X-rays.
Date posted: February 20, 2017. Answers (1)
- Give a reason why the target in an X-ray tube is made of tungesten or molybdenum. (Solved)
Give a reason why the target in an X-ray tube is made of tungesten or molybdenum.
Date posted: February 20, 2017. Answers (1)
- Give a reason why the target in an X-rays makes it possible to detect cracks in bones(Solved)
Give a reason why the target in an X-rays makes it possible to detect cracks in bones
Date posted: February 20, 2017. Answers (1)
- State the factor that determines the hardness of the X-rays produced in an X-ray tube.(Solved)
State the factor that determines the hardness of the X-rays produced in an X-ray tube.
Date posted: February 20, 2017. Answers (1)
- State and explain the effect of increasing the E.H.T in an X-ray tube on the X-rays produced.(Solved)
State and explain the effect of increasing the E.H.T in an X-ray tube on the X-rays produced.
Date posted: February 20, 2017. Answers (1)
- State the energy transformation when fast moving electrons are suddenly stopped by a target in an X-ray tube.(Solved)
State the energy transformation when fast moving electrons are suddenly stopped by a target in an X-ray tube.
Date posted: February 20, 2017. Answers (1)
- State one industrial use of X-rays(Solved)
State one industrial use of X-rays
Date posted: February 20, 2017. Answers (1)
- Name the metal used to shields X-rays operators from the radiation(Solved)
Name the metal used to shields X-rays operators from the radiation. Give a reason why it is used.
Date posted: February 20, 2017. Answers (1)
- The current of electrons hitting the screen of a cathode ray oscilloscope is 2.0 x 10-4A. Determine the number of electrons that strike the screen each second. (take charge of an electrons as 1.6 x 10-19C)
(Solved)
The current of electrons hitting the screen of a cathode ray oscilloscope is 2.0 x 10-4A. Determine the number of electrons that strike the screen each second. (take charge of an electrons as 1.6 x 10-19C)
Date posted: February 20, 2017. Answers (1)
- Name two differences between cathode rays and electromagnetic radiations. (Solved)
Name two differences between cathode rays and electromagnetic radiations.
Date posted: February 20, 2017. Answers (1)
- State two differences between the cathode ray tube (CRT) of a T.V. and the cathode ray oscilloscope (CRO). (Solved)
State two differences between the cathode ray tube (CRT) of a T.V. and the cathode ray oscilloscope (CRO).
Date posted: February 20, 2017. Answers (1)
- The control grids in a Cathode Ray Oscilloscope (CRO) is used to control the brightness of the beam on the screen. How is this achieved? (Solved)
The control grids in a Cathode Ray Oscilloscope (CRO) is used to control the brightness of the beam on the screen. How is this achieved?
Date posted: February 20, 2017. Answers (1)
- State two factors that determine the resistance of metallic conductor and explain how a fuse safeguards electrical appliances against excessive currents.(Solved)
a) State two factors that determine the resistance of metallic conductor.
b) Explain how a fuse safeguards electrical appliances against excessive currents.
c) A hair dryer is rated 2.5kW, 240 V.
i) Determine whether a 10 A fuse may be suitable for the hair dryer
ii) Determine the cost of using the dryer for 3 hours if the cost of electricity is Ksh. 0.80 per kilowatt hour.
Date posted: February 20, 2017. Answers (1)