Light has shorter wavelength than sound
Waves with long wavelength spread widely through small openings.
chrispohmomanyi answered the question on February 9, 2018 at 06:16
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Why is a burn from steam of boiling water more severe than that of boiling water itself?
(Solved)
Why is a burn from steam of boiling water more severe than that of boiling water itself?
Date posted:
February 9, 2018
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Answers (1)
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A bullet is fired horizontally at a target. Neglecting air resistance, give a reason why the horizontal acceleration of the bullet is zero.
(Solved)
A bullet is fired horizontally at a target. Neglecting air resistance, give a reason why the horizontal acceleration of the bullet is zero.
Date posted:
February 9, 2018
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Answers (1)
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If the mirror is rotated through an angle of 10 degrees, by how many degrees will the reflected ray be rotated?
(Solved)
If the mirror is rotated through an angle of 10 degrees, by how many degrees will the reflected ray be rotated?
Date posted:
February 9, 2018
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Answers (1)
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A search boat uses a signal of frequency 6.0 x 104 Hz to detect a sunken
ship directly below. Two reflected signals are received; one...
(Solved)
A search boat uses a signal of frequency 6.0 x 104 Hz to detect a sunken
ship directly below. Two reflected signals are received; one after 0.1
seconds from sunken boat and the other after 0.14 seconds from the sea
bed. If the sea bed is 98 m below the boat, determine:-
(i)The speed of the signal in water.
(ii)The depth of the sunken ship below the boat
Date posted:
February 7, 2018
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Answers (1)
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The half-life of an element X is 3.83 days. A sample of this element is
found to have an activity rate of 1.6 x 103...
(Solved)
The half-life of an element X is 3.83 days. A sample of this element is
found to have an activity rate of 1.6 x 103 disintegrations per second at a
particular time. Determine its activity rate after 19.15 days
Date posted:
February 7, 2018
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Answers (1)
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A gas occupies a volume of 4000 litres at a temperature of 37 degrees celcius and normal atmospheric pressure. Determine the new volume of the gas...
(Solved)
A gas occupies a volume of 4000 litres at a temperature of 37 degrees celcius and
normal atmospheric pressure. Determine the new volume of the gas if it is
heated at constant pressure to a temperature of 670C (normal atmospheric
pressure P= 1.01 x 105 pa)
Date posted:
February 7, 2018
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Answers (1)
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How is the image on a pin hole camera increased?
(Solved)
How is the image on a pin hole camera increased?
Date posted:
February 7, 2018
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Answers (2)
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Distinguish between solid,liquid and gas with reference to intermolecular forces?
(Solved)
Distinguish between solid,liquid and gas with reference to intermolecular forces?
Date posted:
February 5, 2018
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Answers (1)
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Give two mechanical properties of composite materials used in fixing teeth
(Solved)
Give two mechanical properties of composite materials used in fixing teeth.
Date posted:
February 5, 2018
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Answers (1)
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State factors that affect the rate of evaporation
(Solved)
State factors that affect rate of evaporation
Date posted:
January 30, 2018
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Answers (1)
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State the three Newton's laws
(Solved)
State the three Newton's laws
Date posted:
January 30, 2018
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Answers (1)
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Explain the benefits of thermal imaging cameras.
(Solved)
Explain the benefits of thermal imaging cameras.
Date posted:
January 29, 2018
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Answers (1)
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State the advantages of using temperature data loggers.
(Solved)
State the advantages of using temperature data loggers.
Date posted:
January 29, 2018
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Answers (1)
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State the advantages of using K-type thermometers.
(Solved)
State the advantages of using K-type thermometers.
Date posted:
January 29, 2018
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Answers (1)
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State the advantages of using probe thermometers.
(Solved)
State the advantages of using probe thermometers.
Date posted:
January 29, 2018
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Answers (1)
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Identify the benefits of using infrared thermometers.
(Solved)
Identify the benefits of using infrared thermometers.
Date posted:
January 29, 2018
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Answers (1)
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Explain why nylon clothes crackles as you undress.
(Solved)
Explain why nylon clothes crackles as you undress
Date posted:
January 28, 2018
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Answers (1)
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State the four axioms of conservation law
(Solved)
State the four axioms of conservation law
Date posted:
January 27, 2018
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Answers (1)
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State the disadvantages of using mirrors as optical instruments?
(Solved)
State the disadvantages of using mirrors as optical instruments?
Date posted:
January 26, 2018
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Answers (1)
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A body weighs 3.6N in air and 2.4N when fully immersed in water.The density of the body in g/cm^3 is?
(Solved)
A body weighs 3.6N in air and 2.4N when fully immersed in water.The density of the body in g/cm^3 is?
Date posted:
January 25, 2018
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Answers (1)