When graphite particles are suspended in water and observed through a microscope, they are seen to move in a random motion. Explain.

When graphite particles are suspended in water and observed through a microscope, they are seen to move in a random
motion. Explain.

---

The graphite particle are hit by the unseen water molecules which are in random motion.

---

sharon kalunda answered the question on May 30, 2019 at 09:34

Exams With Marking Schemes

• Grade 1
• Grade 2
• Grade 3
• Grade 4
• Grade 5
• Grade 6
• Grade 7
• Grade 8
• Grade 9
• PP1
• PP2
• Playgroup
• Form 1
• Form 2
• Form 3
• Form 4

Related Questions

---

• A uniform rod of length 4m and mass of 4kg is pivoted at 3.6m mark. The rod is held horizontal with a vertical rope at... (Solved)
  

  A uniform rod of length 4m and mass of 4kg is pivoted at 3.6m mark. The rod is held horizontal with a vertical rope at the 4m
  mark, as shown in the figure 3.0 below.
  
  Calculate the tension, T in the rope (Take g = 10N/kg)

  Date posted: May 30, 2019 .    Answers (1)

• The diagram below shows a rectangular wire with loose thread tied in it and dipped in a soap solution to form a film. Draw a diagram... (Solved)
  

  The diagram below shows a rectangular wire with loose thread tied in it and dipped in a soap solution to form a film.
  
  Draw a diagram showing what will be observed when the film is broken at points X and Y.

  Date posted: May 30, 2019 .    Answers (1)

• A car of mass 800kg moves on a circular track of radius 20m. The force of friction between the tyres and the tarmac is 4800N. Determine... (Solved)
  

  A car of mass 800kg moves on a circular track of radius 20m. The force of friction between the tyres and the tarmac is
  4800N. Determine the maximum speed at which the car can be driven on the track without skidding.

  Date posted: May 30, 2019 .    Answers (1)

• A Spring extends by 0.7cm when a mass of 420g is hang on it on earth. By what length would the spring extend if the... (Solved)
  

  A Spring extends by 0.7cm when a mass of 420g is hang on it on earth. By what length would the spring extend if the same
  set up was taken to the moon where the gravitational intensity is one-sixth of that one earth.Take gravitational field intensity on surface of Earth g, 10N/kg.

  Date posted: May 30, 2019 .    Answers (1)

• State what is observed on the screen of a CRO when : i) low voltage alternating current is connected to the time base and the y-gain... (Solved)
  

  State what is observed on the screen of a CRO when :
  i) low voltage alternating current is connected to the time base and the y-gain switched off.
  ii) a high voltage ac is connected to the y-gain and the time base is switched off.

  Date posted: May 30, 2019 .    Answers (1)

• Name a device that can be used to improve on the nature of the output current. (Solved)
  

  Name a device that can be used to improve on the nature of the output current.

  Date posted: May 30, 2019 .    Answers (1)

• Uranium U 234 decays to Polonium P 218 by emitting alpha particles. Determine the number of alpha particles emitted. (Solved)
  

  Uranium U 234 decays to Polonium P 218 by emitting alpha particles. Determine the number of alpha particles emitted.
  

  Date posted: May 30, 2019 .    Answers (1)

• Name one electromagnetic wave whose energy is higher than that of visible light. (Solved)
  

  Name one electromagnetic wave whose energy is higher than that of visible light.

  Date posted: May 30, 2019 .    Answers (1)

• It is advisable to top up acid level of an accumulator with distilled water and not acid. Give a reason for this. (Solved)
  

  It is advisable to top up acid level of an accumulator with distilled water and not acid. Give a reason for this.

  Date posted: May 30, 2019 .    Answers (1)

• The figure below shows three resistors and a p.d of 24V across the resistors.Determine the reading of the voltmeter V. (Solved)
  

  The figure below shows three resistors and a p.d of 24V across the resistors.Determine the reading of the voltmeter V.
  
  

  Date posted: May 30, 2019 .    Answers (1)

• For an echo to be heard, the minimum distance between the obstacle and the observer must be 17m.If the minimum time for hearing an echo... (Solved)
  

  For an echo to be heard, the minimum distance between the obstacle and the observer must be 17m.If the minimum time for hearing an echo is 0.1 seconds. Determine the speed of sound in air.

  Date posted: May 30, 2019 .    Answers (1)

• The figure below shows plane waves incident on a plane reflector inclined at 60^oC to the horizontal. Complete the diagram to show reflected waves. (Solved)
  

  The figure below shows plane waves incident on a plane reflector inclined at 60^oC to the horizontal.
  
  Complete the diagram to show reflected waves.

  Date posted: May 30, 2019 .    Answers (1)

• The figure below shows a plane mirror and the word PHYSICS written on its front. On the same diagram, write down the appearance of the word... (Solved)
  

  The figure below shows a plane mirror and the word PHYSICS written on its front.
  
  On the same diagram, write down the appearance of the word after reflection on the mirror.

  Date posted: May 30, 2019 .    Answers (1)

• The figure below shows a turn table on which a mass of 50g is placed 10cm from the centre. Frictional force between the 50g mass and... (Solved)
  

  The figure below shows a turn table on which a mass of 50g is placed 10cm from the centre.
  
  Frictional force between the 50g mass and the turn table is 0.4N. When the turntable is made to rotate with angular velocity of
  ὦ rads^-1 the mass must starts to slide off.
  i) Determine the :
  I. angular velocity ὦ,
  II. time taken to make one complete revolution
  ii) On the figure draw a path that would be taken by the 50g mass if the turntable suddenly came to a stop.

  Date posted: May 30, 2019 .    Answers (1)

• Sketch the graph of density of water against temperature upto 10^oC. (Solved)
  

  Sketch the graph of density of water against temperature upto 10^oC.

  Date posted: May 30, 2019 .    Answers (1)

• The figure below shows variation of volume of water and temperature as water is heated from 0^oC to 40^oC State the value of P. (Solved)
  

  The figure below shows variation of volume of water and temperature as water is heated from 0^oC to 40^oC
  
  State the value of P.

  Date posted: May 30, 2019 .    Answers (1)

• Apart from the definitions, distinguish between temperature and heat. (Solved)
  

  Apart from the definitions, distinguish between temperature and heat.

  Date posted: May 30, 2019 .    Answers (1)

• An air bubble rises from the bottom of a pond 20m deep until it reaches the top of the pond. The graph below shows variation... (Solved)
  

  An air bubble rises from the bottom of a pond 20m deep until it reaches the top of the pond. The graph below shows variation of pressure exerted on the bubble with volume of the bubble.
  
  i) From the graph, determine the pressure exerted on the bubble and volume of bubble at
  I. the bottom of the pond
  II. the top of the pond
  ii) Explain the shape of the graph.
  iii) Determine the atmospheric pressure at the place of the experiment.
  iv) Sketch in the space below the graph of pressure against reciprocal of pressure for the bubble.

  Date posted: May 30, 2019 .    Answers (1)

• State two factors that must be kept constant for a gas to obey Boyle’s law. (Solved)
  

  State two factors that must be kept constant for a gas to obey Boyle’s law.

  Date posted: May 30, 2019 .    Answers (1)

• The figure below shows two connected bodies of masses 0.5kg and 50g joined by a light inextensible string passing over a smooth pulley. When released,... (Solved)
  

  The figure below shows two connected bodies of masses 0.5kg and 50g joined by a light inextensible string passing over a smooth pulley. When released, the 0.5kg mass moves a distance of 0.6m before coming to rest. The coefficient of friction between the 50g mass and the table is 0.3.
  
  i) Determine :
  I. the tension on the string.
  II. the acceleration of the 0.5kg mass.
  ii) Find the velocity of the 0.5kg mass just before hitting the ground.

  Date posted: May 30, 2019 .    Answers (1)