Waec 2022 physics questions and answers
(i) Their electrical conductivity is low
(ii) They are pure semi conductors with impurities less than 1 and have tetravalent crystals
(iii) Charges are obtained as a result of thermal excitation.
A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 kilometers (22,300 miles) directly over the equator, that revolves in the same direction the earth rotates (west to east).
– Gas Lasers
– Solid-State Lasers.
– Fiber Lasers.
1. Magnetic materials are materials that a magnet will attract to itself when placed near a magnet (or when placed in its field).
NON MAGNETIC MATERIAL
1. Non-magnetic materials that will not experience any magnetic force when placed near a magnet, in other words, it will not be attracted to the magnet.
2. The magnetic state of magnetic materials are aligned either parallel or antiparallel arrangements hence they can respond to a magnetic field when they are under the influence of an external magnetic field.
NON MAGNETIC MATERIAL
2. The magnetic state of non-magnetic materials are arranged in a random manner in such a way that the magnetic movements of these domains are cancelled out. Hence, they do not respond to a magnetic field.
3. Magnetic materials are used to make permanent magnets, as it can be magnetised by a magnet.
NON MAGNET MATERIAL
3. Non-magnetic materials can never be magnetised by a magnet therefore, it can never become a magnetised material.
law of inertia, also called Newton’s first law, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
The Moment of a force is a measure of its tendency to cause a body to rotate about a specific point or axis
Latent heat (also known as latent energy or heat of transformation) is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process — usually a first-order phase transition.
Latent heat can be understood as energy in hidden form which is supplied or extracted to change the state of a substance without changing its temperature. Examples are latent heat of fusion and latent heat of vaporization involved in phase changes, i.e. a substance condensing or vaporizing at a specified temperature and pressure.
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