Wave length = 9/6 = 1.5 cm
Kavungya answered the question on May 27, 2019 at 07:47
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Arrange the following electromagnetic waves in order of their increasing wavelengths.X-rays, Gramma rays, Ultraviolet, Visible light, Microwaves, Infra red.
Date posted: May 27, 2019. Answers (1)
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The waves have a speed of 0.12 m/s in the deep water. Wave crests are 0.08 apart to the deep water. Calculate the frequency of the source producing the waves.
Date posted: May 27, 2019. Answers (1)
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What is half-life of this substance.(Solved)
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What is half-life of this substance.
Date posted: May 27, 2019. Answers (1)
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(i) Work function of sodium
(ii) The kinetic energy of the ejected electrons when sodium is shone with light of frequency 8.6 x 1014Hz.
Date posted: May 27, 2019. Answers (1)
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The surface area of the reservoir is 1.5 x 103...(Solved)
At a hydroelectric power station, three turbines are 100 m below the surface of a reservoir.
The surface area of the reservoir is 1.5 x 103 km2. Water flows through channels from the reservoir to the turbines until the level of water in the reservoir falls by 1.0 cm after 24 hours,if 20% of energy is lost in the form of heat as the water travels through the channels, estimate
the;
(i) Total energy available for the turbines in this 24 hours.
(ii) The average rate of working of each turbine.
Date posted: May 27, 2019. Answers (1)
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(i) Draw a circuit diagram that would ensure that the bulbs have maximum brightness....(Solved)
You are provided with two identical cells. Two lamps and a switch.
(i) Draw a circuit diagram that would ensure that the bulbs have maximum brightness.
(ii) State one advantage of using such an arrangement in (i) above to light a whole house with many bulbs.
Date posted: May 27, 2019. Answers (1)
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internal resistance of the cell.(Solved)
When the switch is closed in the figure below, the millimeter reads 75 mA. Determine the
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Date posted: May 27, 2019. Answers (1)
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Determine the mass remaining after 20 years.(Solved)
The initial mass of radioactive substance is 20 g. The substance has a half life of 2 years.
Determine the mass remaining after 20 years.
Date posted: May 27, 2019. Answers (1)
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(i) Identify radiation K.
(ii) Determine the value of x and y.(Solved)
Below is a nuclear reaction.
(i) Identify radiation K.
(ii) Determine the value of x and y.
Date posted: May 27, 2019. Answers (1)
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Calculate the value of i given that ang = 1.52 and anw =...(Solved)
The diagram below shows a ray of light travelling between water glass interface.
Calculate the value of i given that ang = 1.52 and anw = 4/3.
Date posted: May 27, 2019. Answers (1)
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Using the circuit shown in figure below, calculate the effective capacitance.
Date posted: May 27, 2019. Answers (1)
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are connected end to end and suspended from...(Solved)
Two springs of negligible weight of spring constant K1 = 24 N/m and K2 = 48 N/m respectively
are connected end to end and suspended from a fixed point as shown below.
Determine;
I the total extension when a mass of 1.2 kg is hung from the lower end.
II the constant of the combination
Date posted: May 27, 2019. Answers (1)
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The figure below shows a horizontal tube with two vertical tubes X and Y of equal diameter. Water flows through the horizontal tube from right to left.
(i) Indicate the water levels in the tube X and tube Y.
(ii) Explain your observation in (i)
Date posted: May 27, 2019. Answers (1)
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State one advantage of an electromagnet as compared to a permanent magnet.
Date posted: May 27, 2019. Answers (1)
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An immersion water heater rated 1800 w is used to heat water from 100C to 900C. Calculate the time taken, if the mass of water is 6 kg. (Take specific heat capacity of water as 4200J kg -1K-1)
Date posted: May 27, 2019. Answers (1)
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A student heated some pure water and noticed it boiled at 960C instead of 1000C. If the thermometer was not faulty, what is the possible cause for this?
Date posted: May 27, 2019. Answers (1)
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by the body in 10 seconds.(Solved)
A body starts from rest and accelerated uniformly at 8 m/s2. Calculate the distance traveled
by the body in 10 seconds.
Date posted: May 27, 2019. Answers (1)
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(i) State the velocity ratio of the pulley system.
(ii) If the efficiency of the...(Solved)
The figure below shows a pulley system for lifting heavy object.
(i) State the velocity ratio of the pulley system.
(ii) If the efficiency of the machine is 80%. Calculate the mechanical advantage of the system.
(iii) Determine the effort applied.
Date posted: May 27, 2019. Answers (1)
- A car of mass 900 kg collided heads on with a truck of mass 4000 kg travelling at 40 m/s.
The car is thrown on the...(Solved)
A car of mass 900 kg collided heads on with a truck of mass 4000 kg travelling at 40 m/s.
The car is thrown on the bonnet of the truck, which continues to move after impact at
10 m/s in its original direction. What was the speed of the car?
Date posted: May 27, 2019. Answers (1)
- A cork of volume 200 cm3 is floating on water. If the density of the cork is 0.25 g/cm3.
Calculate;
(i) the mass of the cork.
(ii)...(Solved)
A cork of volume 200 cm3 is floating on water. If the density of the cork is 0.25 g/cm3.
Calculate;
(i) the mass of the cork.
(ii) the upthrust force on the cork.
(iii) the minimum force required to immerse the cork completely.
Date posted: May 27, 2019. Answers (1)