Waec physics practical Questions and answers 2023

Here is the Waec physics practical Questions and answers 2023

ANSWERS

PHYSICS PRACTICAL-ANSWERS

(1bi)
Firstly, the net force acting upon the object must be zero. Secondly, the net torque acting upon the object must also be zero.

(1bii.)
Let F1 = 4N and F2 = 3N.
Resultant force (R) = √(F1^2 + F2^2)
= √((4N)^2 + (3N)^2)
= √(16N^2 + 9N^2)
= √(25N^2)
= 5N(1bi)
(i)Firstly, the net force acting upon the object must be zero.
(ii)Secondly, the net torque acting upon the object must also be zero.
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(2bi)
(i) The light ray moves from a more dense medium to a less dense medium.

(ii)The angle of incidence must be greater than the critical angle

(2bii)The Snell’s law of refraction states that: The incident ray, the refracted ray and the normal at the point of incidence, all lie in the same plane.
(2bi)
If the angle of incidence (θ₁) is greater than the critical angle (θ_c), then total internal reflection occurs.

(2bii) Snell’s law states that the ratio of the sine of the angle of incidence (θ₁) to the sine of the angle of refraction (θ₂) is equal to the ratio of the velocities of light in the two media, which is also equal to the inverse ratio of their refractive indices.
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