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- An x-ray tube operating at a potential difference of 50KV has a tube current 20mA.Calculate.(Solved)
An x-ray tube operating at a potential difference of 50KV has a tube current 20mA.Calculate.
i) The electric power input.
ii) The number of electrons hitting the target per second given that e = 1.6 x 10-19.
iii) The velocity of electrons when they hit the target.
Date posted: September 26, 2019. Answers (1)
- Calculate the maximum velocity of electrons that would produce x-rays of frequency 8.0x108HZ if only 20% of kinetic energy is converted to x – rays.(Take...(Solved)
Calculate the maximum velocity of electrons that would produce x-rays of frequency 8.0x108HZ if only 20% of kinetic energy is converted to x – rays.(Take planks constant = 6.63 x 10-34 JS and mass of electron = 9.1 x 10-31 kg).
Date posted: September 26, 2019. Answers (1)
- List two uses of the graphite used in the T.V set.(Solved)
List two uses of the graphite used in the T.V set.
Date posted: September 26, 2019. Answers (1)
- A concave lens of focal length 15cm forms an image 8cm from the lens.Calculate the object position from the lens.(Solved)
A concave lens of focal length 15cm forms an image 8cm from the lens.Calculate the object position from the lens.
Date posted: September 26, 2019. Answers (1)
- The diagram below shows a glass prism and incident ray striking the surface XY.(Solved)
The diagram below shows a glass prism and incident ray striking the surface XY.
i) Indicate on the diagram the path of the emergent ray.
ii) Calculate the refractive index of the glass prism given that the critical angle of glass is 420
Date posted: September 26, 2019. Answers (1)
- An earthed metal P is placed directly above the plate of a charged electroscope as shown.(Solved)
An earthed metal P is placed directly above the plate of a charged electroscope as shown.
State and explain what is observed when:
i) P is slid slowly sideways.
ii) P remains fixed in its position but a slab of paraffin was is slid slowly between the plates.
Date posted: September 26, 2019. Answers (1)
- Give a reason why it is not advisable to take shelter under a tree especially when it is raining.(Solved)
Give a reason why it is not advisable to take shelter under a tree especially when it is raining.
Date posted: September 26, 2019. Answers (1)
- Give a reason why a candle flame is blown away when a highly charged rod is brought close to it.(Solved)
Give a reason why a candle flame is blown away when a highly charged rod is brought close to it.
Date posted: September 26, 2019. Answers (1)
- A material of resistivity 1x10-2 O m has a cross-section area of 2x10-2 mm2 and length 2m, determine its resistance.(Solved)
A material of resistivity 1x10-2 Ω m has a cross-section area of 2x10-2 mm2 and length 2m, determine its resistance.
Date posted: September 26, 2019. Answers (1)
- The refractive index of turpentine is 1.47,What is the refractive index of the air with respect to turpentine.(Solved)
The refractive index of turpentine is 1.47,What is the refractive index of the air with respect to turpentine.
Date posted: September 26, 2019. Answers (1)
- Kiss FM broadcasts at a frequency of 100 HZ if the velocity of the radio waves is 3.0 x 108 m/s.Calculate the wavelength of radio...(Solved)
Kiss FM broadcasts at a frequency of 100 HZ if the velocity of the radio waves is 3.0 x 108 m/s.Calculate the wavelength of radio waves.
Date posted: September 26, 2019. Answers (1)
- In the circuit diagram in figure below, the voltmeter reads 4 volts.(Solved)
In the circuit diagram in figure below, the voltmeter reads 4 volts.
Determine the ammeter reading.
Date posted: September 26, 2019. Answers (1)
- The figure below shows an object O placed in front of a plane mirror.(Solved)
The figure below shows an object O placed in front of a plane mirror.
Use a ray diagram to locate the position of the image.
Date posted: September 26, 2019. Answers (1)
- Calculate the operating current of a heating element rated 3KW,240 volts.(Solved)
Calculate the operating current of a heating element rated 3KW,240 volts.
Date posted: September 26, 2019. Answers (1)
- A water pipe of diameter 5.2cm is connected to another pipe of diameter 1.3cm.The speed of the water in the smaller pipe is 3m/s.What is...(Solved)
A water pipe of diameter 5.2cm is connected to another pipe of diameter 1.3cm.The speed of the water in the smaller pipe is 3m/s.What is the speed of the water in the larger pipe.
Date posted: September 26, 2019. Answers (1)
- Write down the expression for the equation of continuity and explain its components.(Solved)
Write down the expression for the equation of continuity and explain its components.
Date posted: September 26, 2019. Answers (1)
- An automobile of mass 500 kilograms is accelerated from rest a long a horizontal surface. The force produced by the engine is 300N and that...(Solved)
An automobile of mass 500 kilograms is accelerated from rest a long a horizontal surface. The force produced by the engine is 300N and that due to friction is 50N.What is the accelerating force and what is the acceleration produced.
Date posted: September 26, 2019. Answers (1)
- A trolley of mass 5.00kg resets on a plain horizontal ground shown in the figure below.
i) On the sketch below show the forces acting on...(Solved)
A trolley of mass 5.00 kg resets on a plain horizontal ground shown in the figure below.
i) On the sketch below show the forces acting on it when pulled in one direction
ii) When trolley is pulled with a horizontal force of 24N, the trolley accelerates at 3ms-2.Find the frictional force acting on the trolley
Date posted: September 26, 2019. Answers (1)
- An object which is moving over a horizontal surface does not continue its motion with a constant acceleration when the acceleration force is discontinued. The...(Solved)
An object which is moving over a horizontal surface does not continue its motion with a constant acceleration when the acceleration force is discontinued. The motion decreases to zero finally. Explain what is responsible for this observation.
Date posted: September 26, 2019. Answers (1)
- Distinguish between work and effort.(Solved)
Distinguish between work and effort.
Date posted: September 26, 2019. Answers (1)