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WAEC 2019 PHYSICS OBJ & ESSAY VERIFIED ANSWERS
WAEC 2019 PHYSICS ANSWERS
PHYSICS OBJ:
PHYSICS OBJ:
1-10: CBBBCACBCB
11-20: CCCABB
21-30: C-DADCD-DA
31-40: BDDBBCAABC
41-50: ABDABDBCBA
1)
Mass = 20g = (20/100)kg = 0.02kg
Extension = 5cm = (5/100)m = 0.05m
K = 200N/
V = ?
1/2mv² = 1/2ke²
V = ?ke²/m = ?200×0.05×0.05/0.02
V = ?25
V = 5m/s
=========================
(2a)
P is initial velocity in m/s
? is angle of projection
H is maximum height
R is Range
(2b)
R = P²sin2?/g
at maximum range, sin2? = 1
=> Rmax = p²/g
This happens at ? = 45degree
========================
(3)
(i)reflection
(ii)refraction
(iii)diffraction
============================
(4)
(i)Magnetic Declination
(ii)Horizontal Component of Earth’s Magnetic Field
(iii)The angle of Dip or Magnetic Inclination
==============================
(5a)
Free electrons are electrons in a material which can contribute to electric current.
(5b)
hole is the absence of an electron in a particular place in an atom
===========================
(6a)
Principle of operation of fiber optics state that the density of transparent glass and the refractive index is greater than the density of the two mirrors
(6b)
(i)it is used to view deep down the throat of a patient
(ii)it is used to conveying information
=========================
(8ai) Terminal Velocity: this is the constant speed that a freely falling object eventually reaches when the resistance of the medium through which it is falling prevents further acceleration.
========================
9ai)
Latent heat , energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature . The latent heat associated with melting a solid or freezing a liquid is called the heat of fusion ; that associated with vaporizing a liquid or a solid or condensing a vapour is called the heat of vaporization . The latent heat is normally expressed as the amount of heat (in units of joules or calories ) per mole or unit mass of the substance undergoing a change of state.
(9aii)
(i)surface area in contact with atmosphere
(ii)nature of the liquid
(9bi)
Clay is poorer conductor of heat than plastic
(9bii)
An increase in pressure in the cooker increase the ambient temperature in the cooker hence the food cooks faster
(9c)
(i)Change in the state of a substance
(ii)Increase in temperature
===========================
(10a)
Atomic spactra is the spectra of frequencies of electromagnetic radiation emitted or absorbed during transitions of electrons between energy levels within an atom.
=====================
11a)t when particles are 30 meters apart
S= ut + ½ at2
Sp= st + ½ t2
Sa = 6t + 1/2 (3)t2
Where sp and sa are distances covered by particles respectively at any time t
At time, t= 1.5s
Sp = 5(1.5) + ½(1.5)2 =8.625m
sa = 6(1.5) + ½ (3)(1.5)2 = 12.375m
sp + sa = 8.625 + 12.375
= 21m
Distance between particles = 51 – 21 = 30m
At time t = 1.5s, the particles will be 30 meters apart.
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