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Physics
WAEC / WASSCE 1996
Waves and Optics
A ray of light strikes a plane mirror at a glancing angle of 50o. Calculate the angle between the incident and reflected rays
A
20o
B
40o
C
50o
D
80o
E
100o.
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #25223)
Physics
WAEC / WASSCE 1996
Waves and Optics
Solution
A converging lens of focal length 5cm forms a virtual image which is 10cm from the lens. How far from the lens is the object?
A
2.0cm
B
3.3cm
C
5.0cm
D
10.0cm
E
15.0cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(f = \frac{uv}{u+v}\)
\(5 = \frac{-10u}{-10+u}\)
\(50 + 5u = -10u\)
\(50 = -10u - 5u\)
\(u = \frac{50}{-15}\)
u= -3.3cm
Source: Myschool Past Questions Archive (Record #25230)
Physics
WAEC / WASSCE 1996
Waves and Optics
Which of the following instruments produces sound by the vibration of air column?
A
Piano
B
Guitar
C
Flute
D
Hand bell
E
Talking drum
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #25231)
Physics
WAEC / WASSCE 1996
Waves and Optics
A string of length 1.0 m vibrates in 10 loops. If the total mass of the string is 1.0 x 10-3 kg and the tension in it is 10N, calculate the frequency of the vibration.
A
50Hz
B
100Hz
C
250Hz
D
400Hz
E
500Hz
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #25233)
Physics
WAEC / WASSCE 1996
Waves and Optics
The distance between two successive crests of a water is 1m. lf a particle on the surface of the water makes two complete vertical oscillations in 1 second, calculate the speed of the wave
A
0.5 ms-1
B
1.0 ms-1
C
2.0ms-1
D
3.0ms-1
E
4.0ms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #25234)
Physics
WAEC / WASSCE 1996
Waves and Optics
Diagram
The graph above shows the relationship between sin i and sin r for a ray of light in air incident on a liquid surface. If i and r are respectively angles of incidence and refraction, deduce the refractive index of the liquid from the graph
Attached Figure / Diagram
A
1.63
B
1.50
C
1.33
D
1.25
E
0.08
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #25225)
Physics
WAEC / WASSCE 1996
Waves and Optics
When a ray of light is incident normally on an air- glass interface, its angle of refraction is
A
0o
B
42o
C
45o
D
60o
E
90o
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #25226)
Physics
WAEC / WASSCE 1996
Waves and Optics
Diagram
Solution
A ray of light is incident on a glass block as shown in the diagram above. If the reflected and the retracted rays are perpendicular to each other, what is the refractive index of the glass relative to air.?
Attached Figure / Diagram
A
1.60
B
1.58
C
1.52
D
1.50
E
1.48
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Given: Angle of incidence i = 58º
Reflected and refracted rays are perpendicular.
Since the angle between the reflected ray and the normal is also 58º
\(r + 58^\circ = 90^\circ\)
\(r = 32^\circ\)
Using Snell's law:
\(n=\frac{\sin i}{\sin r}\)
n= \(\frac{\sin58^\circ}{\sin32^\circ}\)
n \(\approx \frac{0.848}{0.530}\) = 1.6
So, the refractive index of the glass relative to air is 1.6.
Source: Myschool Past Questions Archive (Record #25227)
Physics
WAEC / WASSCE 1996
Waves and Optics
Solution
The speed of sound in air is 330ms-1. How far from the centre of a storm is an observer who hears a thunder clap 2s after the lightning flash? (Neglect the time taken by light to travel to the observer)
A
1320m
B
165m
C
600m
D
330m
E
343m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
To determine the distance from the center of the storm to the observer, we use the speed of sound and the time it takes for the sound to reach the observer.
Given: Speed of sound in air: \( v = 330 \, \text{ms}^{-1} \), Time delay: \( t = 2 \, \text{s} \)
The distance \( d \) can be calculated using the formula:
\(d = v \times t\)
Substituting the values:
\(d = 330 \, \text{ms}^{-1} \times 2 \, \text{s} = 660 \, \text{m}\)
Therefore, the distance from the center of the storm is 660 m.
Source: Myschool Past Questions Archive (Record #25236)
Physics
WAEC / WASSCE 1996
Waves and Optics
Diagram
The diagram above represents a stationary wave set up in a string which is fixed at both ends. lf the frequency of the wave is 256Hz and the distance N1 N2 equals 1.5m, calculate the speed of the wave.
Attached Figure / Diagram
A
128ms-1
B
192ms-1
C
384ms-1
D
768ms-1
E
1536ms-1
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #25238)
Physics
WAEC / WASSCE 1996
Waves and Optics
Solution
(a) What is meant by dispersion of white light?
(b) State the colours in the spectrum of white light in ascending order of their wavelengths
(c) Which colour is deviated.
(i) least
(ii) most?
(d) Explain why white light is dispersed when it passes through a glass prism.
(e) Describe, with the aid of a labelled diagram, how a pure spectrum of white light can be produced on a screen.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(a) This is the separation of white light into its component or constituent colours.
(b) VIBGYOR (Violet, Indigo, Blue, Green, Yellow, Orange, Red).
(c)(i) Red (ii) Violet.
(d) White light consists of a mixture of different colours. The refractive index of glass is different for each colour so that when white light falls on the prism each colour in it is refracted at different angles with the result that the colours are spread out to form a spectrum
Description: An illuminated slit is placed at the principal focus of a converging lens, such that parallel beam of light emerging therefrom is incident on a prism which disperses the beam into separate parallel beams of different colours each of which is brought into its own focus in the focal plane of a second lens. Here the spectrum is formed on a white screen.
Source: Myschool Past Questions Archive (Record #54741)
Physics
WAEC / WASSCE 1995
Waves and Optics
Which of the following will reduce the frequency of oscillation of a simple pendulum?
A
Increasing the mass of the bob
B
Decreasing the mass of the bob
C
Increasing the length of the string
D
Decreasing the length of the string
E
Decreasing the amplitude of oscillation
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #25059)
Physics
WAEC / WASSCE 1995
Waves and Optics
An object is placed on the principal axis at the centre of curvature of a concave mirror. The image of the object formed by the mirror is
A
real, inverted and magnified
B
at the principal focus
C
real and diminished
D
erect and virtual
E
at the centre of curvature
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #25078)
Physics
WAEC / WASSCE 1995
Waves and Optics
A wire is stretched between two points, 1m apart. If the speed of the wave generated on plucking the wire is 200ms-1, what is the minimum frequency which will resonate with the wire?
A
50 Hz
B
75 Hz
C
100 Hz
D
150 Hz
E
200 Hz
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #25079)
Physics
WAEC / WASSCE 1995
Waves and Optics
Sixty complete waves pass a particular point in 4s. lf the distance between three successive troughs of the waves is 15m, calculate the speed of the waves,
A
300.0ms-1
B
225.0ms-1
C
112.5ms-1
D
75.0ms-1
E
16.0ms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #25080)