A box made of glass sides contained a mixture of smoke and air. Bright light was shown on it and viewed through a microscope....

A box made of glass sides contained a mixture of smoke and air. Bright light was shown on it and viewed through a microscope. It is observed that the small bright specks are seen to be moving randomly.
a. What are the bright specks?
b. What cause their movement?
c. If the mixture of smoke and air was cooled, what change or changes would be there in the motion of the specks?

---

a. Smoke particles
b. The air molecules knock them making them to move in random manner
c. Particles slows down

---

joseph rimiru answered the question on October 26, 2017 at 10:05

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

---

• The smell of rotten eggs broken in a room spread throughout the room. Explain. (Solved)
  

  The smell of rotten eggs broken in a room spread throughout the room. Explain.

  Date posted: October 26, 2017 .    Answers (1)

• Diffusion support the idea that matter is made up of small particles. Explain. (Solved)
  

  Diffusion support the idea that matter is made up of small particles. Explain.

  Date posted: October 26, 2017 .    Answers (1)

• Some pollen grains were placed in water, explain how their motion supports the idea that matter is in continuous state of motion. (Solved)
  

  Some pollen grains were placed in water, explain how their motion supports the idea that matter is in continuous state of motion.

  Date posted: October 26, 2017 .    Answers (1)

• A roof of a certain house has a surface area of 40000cm^2. If the atmospheric pressure exerted on the roof is 103000 pa, determine the... (Solved)
  

  A roof of a certain house has a surface area of 40000cm^2. If the atmospheric pressure exerted on the roof is 103000 pa, determine the force on it. (take g=10N/kg)

  Date posted: October 26, 2017 .    Answers (1)

• A water manometer was used to measure the pressure of a gas and its height was found to be 40cm. What would be the height... (Solved)
  

  A water manometer was used to measure the pressure of a gas and its height was found to be 40cm. What would be the height of a manometer whose liquid is glycerine of density 1.26g/cm^3?

  Date posted: October 26, 2017 .    Answers (1)

• The barometer in a city was found to be 70 cmHg. Given that the standard atmospheric pressure is 75 cmHg and the density of mercury... (Solved)
  

  The barometer in a city was found to be 70 cmHg. Given that the standard atmospheric pressure is 75 cmHg and the density of mercury is 13600kg/m^3, determine the altitude of the city. (density of air is 125kg/m^3)

  Date posted: October 26, 2017 .    Answers (1)

• A certain hydraulic press, a force of 100N is applied to master piston of area 25cm^2. If it is designed to produce a force... (Solved)
  

  A certain hydraulic press, a force of 100N is applied to master piston of area 25cm^2. If it is designed to produce a force of 6000N, determine
  a. The area of the slave piston.
  b. Radius of the slave piston.
  

  Date posted: October 26, 2017 .    Answers (1)

• The atmospheric pressure on a cold day was found to be 760mmHg. Express this in N/m^2(assume density of mercury is 13600kg/m^3 and take g=10N/kg). (Solved)
  

  The atmospheric pressure on a cold day was found to be 760mmHg. Express this in N/m^2(assume density of mercury is 13600kg/m^3 and take g=10N/kg).

  Date posted: October 26, 2017 .    Answers (1)

• A fountain pen is filled up with ink. Explain. (Solved)
  

  A fountain pen is filled up with ink. Explain.

  Date posted: October 26, 2017 .    Answers (1)

• A mercury barometer reads 75cm in a certain place. If one was to use an alcohol barometer, what would be the minimum length used to... (Solved)
  

  A mercury barometer reads 75cm in a certain place. If one was to use an alcohol barometer, what would be the minimum length used to read the same pressure as the mercury barometer (take =10N/kg, mercury 13600kg/m^3, alcohol = 800kg/m^3)

  Date posted: October 25, 2017 .    Answers (1)

• A passenger traveling by train found that the barometer height at sea level is 76 cm of mercury while at point on the highland is 70 cm... (Solved)
  

  A passenger traveling by train found that the barometer height at sea level is 76 cm of mercury while at point on the highland is 70 cm of mercury. What is the altitude of the point? (take g as 10 N/kg, the density of mercury as 13600 kg/m^3 and density of air 1.25kg/m^3)

  Date posted: October 25, 2017 .    Answers (1)

• Water and mercury column differ though they experience the same atmospheric pressure for their support. Explain. (Solved)
  

  Water and mercury column differ though they experience the same atmospheric pressure for their support. Explain.

  Date posted: October 25, 2017 .    Answers (1)

• A mountain climber found that the air pressure at the base of a mountain is 75.0cm of mercury while at the top is 50cm of... (Solved)
  

  A mountain climber found that the air pressure at the base of a mountain is 75.0cm of mercury while at the top is 50cm of mercury. Given that the average density of air is 1.25kg/m^3 and the density of mercury is 13600kg/m^3. Calculate the height of the mountain.

  Date posted: October 25, 2017 .    Answers (1)

• A sea diver is 45m below the surface of sea water. Given that the density of the sea water is 1030kg/m^3 and g=10kg/kg atmospheric pressure... (Solved)
  

  A sea diver is 45m below the surface of sea water. Given that the density of the sea water is 1030kg/m^3 and g=10kg/kg atmospheric pressure 103000pa determine the total pressure on him.

  Date posted: October 25, 2017 .    Answers (1)

• A student in the coast region (sea level) made a barometer using sea-water of density 1030kg/m^3. If the atmosphere pressure is 103000 N/m^2, what is... (Solved)
  

  A student in the coast region (sea level) made a barometer using sea-water of density 1030kg/m^3. If the atmosphere pressure is 103000 N/m^2, what is the minimum length of the tube did the student use for the water column?

  Date posted: October 25, 2017 .    Answers (1)

• Describe an experiment to show that pressure in a liquid increases with depth. (Solved)
  

  Describe an experiment to show that pressure in a liquid increases with depth.

  Date posted: October 25, 2017 .    Answers (1)

• Water storage tanks in flats are erected as high as possible. Explain. (Solved)
  

  Water storage tanks in flats are erected as high as possible. Explain.

  Date posted: October 25, 2017 .    Answers (1)

• A hole of diameter 50cm is made 30m below the surface of water in a dam. At what force would the water spew out when... (Solved)
  

  A hole of diameter 50cm is made 30m below the surface of water in a dam. At what force would the water spew out when it is fully opened. (take g as 10N/kg and density of 1g/cm^3)

  Date posted: October 25, 2017 .    Answers (1)

• Calculate the pressure due to water experience by a sea diver working 35m below the surface of the sea. (Take g=10N/kg, and density of sea... (Solved)
  

  Calculate the pressure due to water experience by a sea diver working 35m below the surface of the sea. (Take g=10N/kg, and density of sea water 1.02g/cm^3)

  Date posted: October 25, 2017 .    Answers (1)

• A density bottle weights 70 g with water and 94 g with liquid A. Find density of liquid A if density of water is 1000 kg/m (Solved)
  

  A density bottle weights 70 g with water and 94 g with liquid A. Find density of liquid A if density of water is 1000 kg/m

  Date posted: October 23, 2017 .    Answers (1)