2018 WAEC PHYSICS OBJ AND ESSAY

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*PHYSIC ANSWER*

(1a)
Strain can be defined as the ratio of extension per unit length
Strain=extension/length

(1b)
Strain=extension/length
Let original length=L
Final length=2L
Extension=2L-L=L
Strain=L/L=1

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4a)
Satellite are used for monitoring weather conditions

4b)
i)Rockets are used for space travel
ii)military uses,
iii)launching satellites into space

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5a)
i)They are used In making electric motors
ii)They are used In making radio loud speaker
iii)They are used In making aerial transistors
iv)They are used In making DC dynamo

5b)
Range = u²Sin2tita/g
At maximum range
Sin2tita = 1
2tita =sin^-1(1)
2tita = 90dgrees
Tita = 90/2 = 45degree

Maximum height reached = u²sin²tita/2g
=u²(sin45)²/2g
=200²(sin45)²/2(10)
=40000(1/√2)2/20
=40000(1/2)/20
=20000/20
=1000metres.


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(6)
Given constant = 2.9×10^-3mk
Temperature = 57degreeC = (57+273)k = 330k
Using landamaxT = constant
landamaxT330 = 2.9×10^-3
landamax = 2.9×10^-3/330
landamax = 8.788×10^-6m
The speed of electromagnetic wave, v = 3×10^8m/s
Using V = f landa
f = v/landa
=3×10^8/8.788×10^-6
=3.4×10^13Hz

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7a) LASER stands for light amplification by stimulated Emission of Radiation

b).  A laser is a device that emits a beam of coherent light through an optical amplification process


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10a) Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit. It is defined as the bending of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle.

10bi
the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.

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12a) This is defined as the amount of energy that must be supplied to a nucleus to completely separate it's nuclear particles (nucleons)

12b)
i) They have short wavelength and high frequency.
ii) They are highly penetrating.
iii) They travel in straight lines.
iv) They don't require material medium for their propagation.

*PHYSICS ANSWERS*

*1a*
Strain is
force (a part of one's body or oneself) to make an unusually great effort.

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2 )
i ) quantity of charge
ii) nature of element
iii ) Time

2bi
The boiling point of a liquid Is the point at which The vapour pressure is equal To atmospheric pressure

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3)
-Diamagnetic material
-Paramagnetic material
-Ferromagnetic material
4a)
Satellite are used for monitoring weather conditions

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=====5)
i)They are used In making electric motors
ii)They are used In making radio loud speaker
iii)They are used In making aerial transistors
iv)They are used In making DC dynamo
===============

*5)*
Range = u²Sin2tita/g
At maximum range
Sin2tita = 1
2tita =sin^-1(1)
2tita = 90dgrees
Tita = 90/2 = 45degree

Maximum height reached = u²sin²tita/2g
=u²(sin45)²/2g
=200²(sin45)²/2(10)
=40000(1/√2)2/20
=40000(1/2)/20
=20000/20
=1000metres.
=========================

6)
Given constant = 2.9×10^-3mk
Temperature = 57degreeC = (57+273)k = 330k
Using landamaxT = constant
landamaxT330 = 2.9×10^-3
landamax = 2.9×10^-3/330
landamax = 8.788×10^-6m
The speed of electromagnetic wave, v = 3×10^8m/s
Using V = f landa
f = v/landa
=3×10^8/8.788×10^-6
=3.4×10^13Hz

*EXAMBOSS PORTAL TYPING*
4b)
i)Rockets are used for space travel
ii)military uses,
iii)launching satellites into space

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9dii
Q=mlv
Lw=q/m
Q=313885.7
M=1.04kg
Lw=313885.7/1.04
=301013.2j/k


7(a). LASER stands for Light Amplification by Stimulated Emission of Radiation.

    (b). A laser is a device that emits a beam of coherent light through an optical amplification process.

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10a) Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit. It is defined as the bending of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle.

*10bi*
the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.

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12a)
 binding energy is the minimum energy that would be required to disassemble the nucleus of an atom into its component parts. These component parts are neutrons and protons, which are collectively called nucleons.

12b) They have short wire length and high frequency.
-They are highly penetrating
-They travel in straight line
-They don't require material medium for their propagation


2biThe boiling point of a liquid Is the point at which The vapour pressure is equal To atmospheric pressure

4a)An intrinsic semiconductor, also called an undoped semiconductoror i-type semiconductor, is a pure semiconductor without any significant dopant species present. The number of charge carriers is therefore determined by the propertiges of the material itself instead of the amount of impurities.
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5)
i)They are used In making electric motors
ii)They are used In making radio loud speaker
iii)They are used In making aerial transistors
iv)They are used In making DC dynamo

4a)
Satellite are used for monitoring weather conditions

4b)
i)Rockets are used for space travel
ii)military uses,
iii)launching satellites into space

2)
i)quantity of charge
ii)nature of element
iii)Time



7(a). LASER stands for Light Amplification by Stimulated Emission of Radiation.

    (b). A laser is a device that emits a beam of coherent light through an optical amplification process.
------------------
10a) Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit. It is defined as the bending of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle.

10b)
Critical angle: the angle of incidence beyond which rays of light passing through a denser medium to the surface of a less dense medium are no longer refracted but totally reflected.
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12a)
 binding energy is the minimum energy that would be required to disassemble the nucleus of an atom into its component parts. These component parts are neutrons and protons, which are collectively callejd nucleons.
(12a)
binding energy is the minimum energy that would be required to disassemble the nucleus of an atom into its component parts. These component parts are neutrons and protons, which are collectively called nucleons.

(12b) They have short wire length and high frequency.
-They are highly penetrating
-They travel in straight line
-They don't require material medium for their propagation

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