1. They can destroy or damage living cells when over exposed.
2. Excessive exposure of living cells can lead to genetic mutation.
3. As a precautionary measure X-ray tubes are shielded by lead shields.
Mutiso answered the question on October 16, 2018 at 19:13
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An x-ray tube operates at 60 kV and the current through it is 4.0 mA. Calculate the, (a) Number of electrons striking the target per...
(Solved)
An x-ray tube operates at 60 kV and the current through it is 4.0 mA. Calculate the, (a) Number of electrons striking the target per second. (b) Speed of the electrons when they hit the target.
Date posted:
October 16, 2018
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Answers (1)
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Determine the energy possessed by X-rays whose frequency is 4 × 1017 Hz.
(Solved)
Determine the energy possessed by X-rays whose frequency is 4 × 1017 Hz.
Date posted:
October 16, 2018
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Answers (1)
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Energy changes in X-Ray tube
(Solved)
Energy changes in X-Ray tube
Date posted:
October 16, 2018
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Answers (1)
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If the time base control of the CRO is set at 10 milliseconds per cm, what is the frequency of the wave traced given wavelength...
(Solved)
If the time base control of the CRO is set at 10 milliseconds per cm, what is the frequency of the wave traced given wavelength as 1.8 cm?
Date posted:
October 16, 2018
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Answers (1)
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Cathode Ray Oscilloscope components and functioning
(Solved)
Cathode Ray Oscilloscope components and functioning.
Date posted:
October 16, 2018
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Answers (1)
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What are cathode rays?
(Solved)
What are cathode rays?
Date posted:
October 16, 2018
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Answers (1)
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Illustrate domestic wiring system with aid of a diagram
(Solved)
Illustrate domestic wiring system with aid of a diagram
Date posted:
October 16, 2018
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Answers (1)
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A house has five rooms each with a 60 W, 240 V bulb. If the bulbs are switched on from 7.00 pm to 10.30 pm,...
(Solved)
A house has five rooms each with a 60 W, 240 V bulb. If the bulbs are switched on from 7.00 pm to 10.30 pm, calculate the;
(a) Power consumed per day in kWh
(b) Cost per week for lighting those rooms if it costs 90 cents per unit.
Date posted:
October 16, 2018
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Answers (1)
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An electric heater is made of a wire of resistance 100 ${\Omega}$ connected to a 240 V mains supply. Determine the; (a) Power rating of...
(Solved)
An electric heater is made of a wire of resistance 100 ${\Omega}$ connected to a 240 V mains supply. Determine the;
(a) Power rating of the heater
(b) Current flowing in the circuit
(c) Time taken for the heater to raise the temperature of 200 g of water from 23oC to 95oC. (specific heat capacity of water = 4,200 J Kg-1K-1)
(d) Cost of using the heater for two hours a day for 30 days if the power company charges Ksh 5.00 per kWh.
Date posted:
October 16, 2018
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Answers (1)
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An electric kettle is rated at 2,500 W and uses a voltage of 240 V. (a) If electricity costs Ksh 1.10 per kWh, what is...
(Solved)
An electric kettle is rated at 2,500 W and uses a voltage of 240 V. (a) If electricity costs Ksh 1.10 per kWh, what is the cost of running it for 6 hrs? (b) What would be its rate of dissipating energy if the mains voltage was dropped to 120 V?
Date posted:
October 16, 2018
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Answers (1)
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An electric heater running on 240 V mains has a current of 2.5 A. (a) What is its power rating? (b) What is the resistance...
(Solved)
An electric heater running on 240 V mains has a current of 2.5 A. (a) What is its power rating? (b) What is the resistance of its element?
Date posted:
October 16, 2018
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Answers (1)
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What are the dangers of high voltage transmission lines?
(Solved)
What are the dangers of high voltage transmission lines?
Date posted:
October 16, 2018
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Answers (1)
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What is electricity distribution?
(Solved)
What is electricity distribution?
Date posted:
October 16, 2018
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Answers (1)
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Briefly explain the process of power generation and transmission
(Solved)
Explain the process of power transmission
Date posted:
October 16, 2018
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Answers (1)
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What is power transmission?
(Solved)
What is power transmission?
Date posted:
October 16, 2018
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Answers (1)
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Outline uses of transformers
(Solved)
Outline uses of transformers.
Date posted:
October 16, 2018
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Answers (1)
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A step-up transformer has 10,000 turns in the secondary coil and 100 turns in the primary coil. An alternating current of 0.5 A flows in...
(Solved)
A step-up transformer has 10,000 turns in the secondary coil and 100 turns in the primary coil. An alternating current of 0.5 A flows in the primary circuit when connected to a 12.0 V a.c. supply.
(a) Calculate the voltage across the secondary coil (b) If the transformer has an efficiency of 90%, what is the current in the secondary coil?
Date posted:
October 16, 2018
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Answers (1)
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A current of 0.6 A is passed through a step up transformer with a primary coil of 200 turns and a current of 0.1 A...
(Solved)
A current of 0.6 A is passed through a step up transformer with a primary coil of 200 turns and a current of 0.1 A is obtained in the secondary coil. Determine the number of turns in the secondary coil and the voltage across if the primary coil is connected to a 240 V mains.
Date posted:
October 16, 2018
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Answers (1)
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What are the applications of mutual induction?
(Solved)
What are the applications of mutual induction?
Date posted:
October 16, 2018
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Answers (1)
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How does mutual induction occur?
(Solved)
How does mutual induction occur?
Date posted:
October 16, 2018
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Answers (1)