A polaroid absorbs or cuts off light waves in all planes except in a particular plane of propagation.
johnmulu answered the question on February 14, 2017 at 13:45
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What characteristic of sound is applied in tuning pianos?
(Solved)
What characteristic of sound is applied in tuning pianos?
Date posted:
February 14, 2017
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Answers (1)
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Distinguish between stationary and progressive waves
(Solved)
Distinguish between stationary and progressive waves.
Date posted:
February 14, 2017
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Answers (1)
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State a characteristic of sound, which is determined by overtone
(Solved)
State a characteristic of sound, which is determined by overtone.
Date posted:
February 14, 2017
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Answers (1)
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Name the property of light that shows that it is a transverse wave
(Solved)
Name the property of light that shows that it is a transverse wave.
Date posted:
February 14, 2017
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Answers (1)
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Name the property of light that shows that it is a transverse wave
(Solved)
Name the property of light that shows that it is a transverse wave.
Date posted:
February 14, 2017
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Answers (1)
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In an experiment using a ripple tank the frequency, f, of the electric pulse generator was reduced to one third of its value
(Solved)
In an experiment using a ripple tank the frequency, f, of the electric pulse generator was reduced to one third of its value. How does the new wavelength compare with the initial wavelength? Explain your answer.
Date posted:
February 14, 2017
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Answers (1)
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State two ways by which the frequency of a note produced by a given guitar wire may be increased
(Solved)
State two ways by which the frequency of a note produced by a given guitar wire may be increased.
Date posted:
February 14, 2017
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Answers (1)
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State Ohm’s Law
(Solved)
State Ohm's Law.
Date posted:
February 14, 2017
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Answers (1)
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State one condition under which Ohm's law is obeyed in a metal conductor.
(Solved)
State one condition under which Ohm's law is obeyed in a metal conductor.
Date posted:
February 14, 2017
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Answers (1)
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A current of 0.70 A flows through a wire when a p.d. of 0.35 V is applied at the ends of the wire. If the wire is 0.5 m long...
(Solved)
A current of 0.70 A flows through a wire when a p.d. of 0.35 V is applied at the ends of the wire. If the wire is 0.5 m long and has a cross section area of 8.0 x 10-3m2. Determine its resistivity.
Date posted:
February 14, 2017
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Answers (1)
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A circuit consists of a battery, a metal wire, an ammeter and a switch connected in series. The switch is closed and the ammeter reading noted
(Solved)
A circuit consists of a battery, a metal wire, an ammeter and a switch connected in series. The switch is closed and the ammeter reading noted. The metal wire is now heated. State the observations made on the ammeter reading and give a reason for your answer.
Date posted:
February 14, 2017
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Answers (1)
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State the reason why a voltmeter of high resistance is more accurate in measuring potential differences than one of low resistance.
(Solved)
State the reason why a voltmeter of high resistance is more accurate in measuring potential differences than one of low resistance.
Date posted:
February 14, 2017
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Answers (1)
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In large current circuits, large resistors in parallel are preferred to low resistors in series. Explain
(Solved)
In large current circuits large resistors in parallel are preferred to low resistors in series. Explain.
Date posted:
February 14, 2017
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Answers (1)
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Define the term velocity ratio of a machine
(Solved)
Define the term velocity ratio of a machine.
Date posted:
February 14, 2017
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Answers (1)
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State two reasons why the efficiency of a pulley system is always less than 100%
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State two reasons why the efficiency of a pulley system is always less than 100%.
Date posted:
February 14, 2017
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Answers (1)
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A cyclist initially at rest moved down a hill without pedaling. He applied brakes and eventually stopped
(Solved)
A cyclist initially at rest moved down a hill without pedaling. He applied brakes and eventually stopped. State the energy changes as the cyclist moved down the hill.
Date posted:
February 14, 2017
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Answers (1)
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Define the term efficiency of a machine
(Solved)
Define the term efficiency of a machine.
Date posted:
February 14, 2017
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Answers (1)
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A certain machine uses an effort of 400 N to raise a load of 60 0N. If the efficiency of the machine is 75%, determine its velocity ratio
(Solved)
A certain machine uses an effort of 400 N to raise a load of 600N. If the efficiency of the machine is 75%, determine its velocity ratio.
Date posted:
February 14, 2017
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Answers (1)
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A crane lift a load of 2000 kg through a vertical distance of 3.0 m in 6 seconds. Determine the (i) Work done
(Solved)
A crane lift a load of 2000 kg through a vertical distance of 3.o m in 6 seconds.Determine the:
i) Work done
ii) Power development by the crane
iii) Efficiency of the crane given that it is operated by an electric motor rated 12.5 KW.
Date posted:
February 14, 2017
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Answers (1)
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A certain machine raises 2.0 tonnes of water through 22 metres. If the efficiency of the machine is 80%, how much work is done on the machine?
(Solved)
A certain machine raises 2.0 tonnes of water through 22 metres. If the efficiency of the machine is 80%, how much work is done on the machine?
Date posted:
February 14, 2017
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Answers (1)