WAEC 2017 PHYSIC OBJ AND THEORY ANSWER
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1)decrease in height (h)
increase in time (t)
this shows that distance changes with time
2)given that U=15m3^-1
3i) Brownian Motion
II) Atomic Size
4) Let the unstrength legth be Lo
By increasing the density mosquitoes lavrva than the density of water
6i)Energy efficient- so far the best light for interior lighting.
ii)Low production cost (of tubes, not of the ballasts)
iii)Long life of tubes.
i)It requires low voltage sources for it to function
ii)It cannot be easily broken
iii)It is cheaper and quite easy to manufacture
8a) It is a straight line graph
II) The gradient is the velocity
8b)If their distance and masses are doubled their corresponding force would also be doubled and the work done respectively
I.e.Workdone=Force * distance
Force= Mass * Acceleration
W= Mg * d
8c) -Acceleration due to gravity
– At maximum height, final velocity is zero
8d (i)pushing someone on a swing.
(ii)Tuning a radio to a particular frequency.
10a) A wave front is an imaginary surface passing through the points of a medium oscillatory in phase
10bi)Prismatic binoculars is used to see round corners
II) Prism Periscope is used to bend and reflect light
10bii)i) Refractive index of the glass prism
II) The angle of the incident of ray
12ai)Nuclear fission is a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.
12aii)a)A graphite reactor is a nuclear reactor that uses carbon as a neutron moderator, which allows un-enriched uranium to be used as nuclear fuel.
12aii)b)Boron rods are used in
nuclear reactors to control the fission rate of uranium and plutonium. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning.
A wave front is an imaginary surface passing through the points of a medium oscillatory in phase
10bi) 1. Prison periscopeuse in harmod car
2. Prismatic binicular to see round corner
10bii) Refraction index of the glass prison
The angle of incident of the ray
GALANT WAP FOREVER