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)
-
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)
-
When a transformer is connected to ac source, the output voltage is found to be 24 V. If the power input is 200 W,
(Solved)
When a transformer is connected to ac source, the output voltage is found to be 24 V. If the power input is 200 W, determine the output current. (Assume the transformer is 100% efficient)
Date posted:
February 20, 2017
.
Answers (1)