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# WAEC 2018 PHYSICS (OBJ & THEORY) ANSWER — May/June EXPO Phy OBJ
11-20: ACCCDABDCC
31-40: CCBBCCBABD
41-50: BDCDBABBDC
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1
Strain is
force (a part of one’s body or oneself) to make an unusually great effort.
1b)
Strain=extension/length
Let original length=L
Final length=2L
Extension=2L-L=L
Strain=L/L=1
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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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4b)
i)Rockets are used for space travel
ii)military uses,
iii)launching satellites into space
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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.
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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 is the ability of waves to bend around obstacles in their path
(10bi)
Critical angle is the highest angle of incidence in a denser medium when angle of refraction in the less dense mediumis 90 degrees
(10bii)
Critical angle=90-44=46degrees
The refractive index of the glass is obtained as follows
The refractive index(n)=sini/sinr=sin46/sin90=0.7193/1
=0.7193
(10ci)
fo=200Hz
f1=3v/4l =>closed pipe
f1=v/l=>open pipe
but 3fo=f1=>closed pipe
3*200=f1=>f1=600Hz
Also f1=2fo=>open pipe
2fo=600
fo=600/2=300Hz
(10cii)
v=330m/s
L=?
fo=200Hz
fo=v/4l
=>200=330/4l
800l=330
l=330/800
l=0.4124m
(10ciii)
fo=v/2l
fo=300Hz
v=330m/s
300=330/2l
l=330/600
l=0.55m
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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.
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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.
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