WAEC 2020/2021 Physics Obj & Theory/Essay Questions and Answers Is out

Waec 2020/2021  physic Obj And Theory/Essay questions answers is out
Waec 2020/2021  physic Obj And Theory/Essay questions answers is out

OBJ COMING UP 

STILL SOLVING..................






  (2a)
Flat metal plate are mainly used to collect heat for space heating in solar panels for heat transfer.

(2b)
Thermal insulator is used for reduction of heat transfer between objects in thermal contact

(2c)
tubes is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.

(3a)
highly purified silica glass.

(3b)
To confine the optical signal in the core , the refractive index of the core must be greater than that of the cladding.


(4)
V∝ Tx μy
LT-∝(MLT-²)x(MLT-¹)y
LT-¹∝ m*L*T-²x x m y L-y
LT-¹∝ m(x+y)L(x-y)T-²x
Comparing
X-y=1
X+y=0
-2x=1
From equation 3
X=½
Putting x = ½ into (eq) 2
y=-½
Equation is
V∝ T½ μ-½
V∝ √T/μ
V= k√T/μ
Where k is constant


(10ai)Critical angle: this is the angle of incidence that
 provides an angle of refraction of 90-degrees.

(10aii)
(i) Light must travel from a denser medium to a rarer medium and 
(ii) the angle of incidence inside the denser medium must be greater than the critical angle.

(10aiii)
-In elescopes application  
-In microscopes applications
-In the binoculars

(10b)

i) Bending of light;If light is moving from rarer to denser medium then it moves towards the normal. 
If it is moving from denser to rarer medium then it moves away from the normal.

ii)Change in wavelength of light

(10ci)

Progressive wave; is a wave which travels continuously in a medium in the same direction without the change in its amplitude

INSTRUCTIONS

ANSWER ONLY FIVE(5) QUESTIONS FROM PART I_

ANSWER ONLY THREE(3) QUESTIONS FROM PART II


TOTAL 8 QUESTIONS

❤️❤️❤️❤️❤️❤️❤️❤️❤️

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WAEC 2020/2021 physics Obj & Theory/Essay questions and answers : 

What is physics?


WAEC 2020 Mathematics questions and answers 

Physics (from historical Greek: φυσική (ἐπιστήμη), romanized: physikḗ (epistḗmē), lit. 'knowledge of nature', from φύσις phýsis 'nature') is the herbal science that studies rely, its motion and conduct via space and time, and the related entities of electricity and force.

Physics is one of the important purpose  to understand how the universe behaves with the most essential scientific disciplines.

Through physics its inclusion of astronomy, perhaps and one of the oldest educational disciplines .  Over plenty of the past  millennia, physics, chemistry, biology, and positive branches of mathematics had been a part of herbal philosophy, but throughout the clinical Revolution inside the seventeenth century these natural sciences emerged as specific studies endeavors in their personal proper.

Physics along with biophysics and quantum chemistry, and the boundaries of physics aren't rigidly defined. intersects with many interdisciplinary areas of research, in physics frequently give an explanation for the fundamental mechanisms studied via other sciences  and suggest new avenues of research in instructional disciplines inclusive of mathematics and philosophy.

Advances in physics regularly enable advances in new technologies. As an instance, advances within the know-how of electromagnetism, stable-kingdom physics, and nuclear physics led immediately to the improvement of recent products which have dramatically converted cutting-edge-day society, consisting of tv, computer systems, domestic home equipment, and nuclear guns; advances in thermodynamics caused the improvement of industrialization; and advances in mechanics inspired the improvement of calculus.

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