Tungsten or molybdenum have very high melting point hence they can withstand high temperatures
johnmulu answered the question on February 20, 2017 at 07:34
- 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)
- 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)
- In domestic wiring systems lamps in the circuit are required to be in parallel and not in series. State two reasons for this requirement. (Solved)
In domestic wiring systems lamps in the circuit are required to be in parallel and not in series. State two reasons for this requirement.
Date posted: February 20, 2017. Answers (1)
-
A house has one 100 W bulb, two 60 W bulbs and one 30 W bulb. Determine the cost of having all the bulbs switched on for 70 hours, given that the cost of electricity is 40 cents per kilowatt hour.
(Solved)
A house has one 100W bulb, two 60 W bulbs and one 30 W bulb. Determine the cost of having all the bulbs switched on for 70 hours, given that the cost of electricity is 40 cents per kilowatt hour.
Date posted: February 20, 2017. Answers (1)
- State the reason why electrical power is transmitted over long distances at very high voltage(Solved)
State the reason why electrical power is transmitted over long distances at very high voltage
Date posted: February 20, 2017. Answers (1)
- How many 1000w electric irons could be safely connected to a 240 V main circuit fitted with 13 A fuse?(Solved)
How many 1000w electric irons could be safely connected to a 240 V main circuit fitted with 13 A fuse?
Date posted: February 20, 2017. Answers (1)
- In a transformer, the ratio of primary turns to the secondary turns is 1:10. A. A current 500mA flows through a 200$\Omega$ resistor in the secondary circuit. Assuming that the transformer is 100% efficient, determine;(Solved)
In a transformer, the ratio of primary turns to the secondary turns is 1:10. A. A current 500mA flows through a 200$\Omega$ resistor in the secondary circuit. Assuming that the transformer is 100% efficient, determine;
(i) The secondary voltage
(ii) The primary voltage;
Date posted: February 20, 2017. Answers (1)
- What is meant by the term “electromagnetic induction”?(Solved)
State what is meant by the term “electromagnetic induction”.
Date posted: February 20, 2017. Answers (1)
- Why is electric power is transmitted over long distances at high voltage?(Solved)
Explain why electric power is transmitted over long distances at high voltage.
Date posted: February 20, 2017. Answers (1)
- Explain how energy losses in a transformer are reduced by having:
(Solved)
Explain how energy losses in a transformer are reduced by having:
(i) A soft-iron core-
(ii) A laminated core
Date posted: February 20, 2017. Answers (1)