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Physics
WAEC / WASSCE 2005
Waves and Optics
The amplitude of a wave is the
A
distance travelled by the wave in a complete cycle of its motion
B
maximum diplacement of the wave particle from the equilibrum position
C
separation of two adjacent particles vibrating in a phase
D
distance between two successive troughs of the wave
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #34518)
Physics
WAEC / WASSCE 2005
Waves and Optics
Which of the following optical instruments does not depend on the use of plane mirrors?
A
kaleidoscope
B
simple microscope
C
sextant
D
simple periscope
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #34522)
Physics
WAEC / WASSCE 2005
Waves and Optics
A ray of light is incident normally on a plan mirror. If the incident ray is kept fixed while the mirror is rotated through an angle of 30o, determine the initial and final angles of reflection respectively
A
0o and 60o
B
90o and 30o
C
0o and 30o
D
90o and 60o
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 #34524)
Physics
WAEC / WASSCE 2005
Waves and Optics
In which of the following media is the transmission of sound wave fastest?
A
Vacuum
B
Air
C
Wood
D
Iron
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 #34525)
Physics
WAEC / WASSCE 2005
Waves and Optics
A process by which two light atoms join to form a new atom of higher atomic mass is
A
natural radioactivity
B
nuclear fission
C
nuclear fusion
D
chain reaction
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 #34594)
Physics
NECO SSCE 2005
Waves and Optics
Solution
When a yellow card is viewed in blue light, It will appear
A
black
B
orange
C
purple
D
red
E
white
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Yellow does not contain blue, so it will appear black under blue light
Source: Myschool Past Questions Archive (Record #43011)
Physics
NECO SSCE 2005
Waves and Optics
Which of the following will reduce the frequency of oscillation of a simple pendulum?
A
Decreasing the length of the string
B
Increasing the amplitude of oscillation
C
Increasing the length of the string
D
Increasing the mass of the bob
E
Reducing the mass of the bob.
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 #43027)
Physics
NECO SSCE 2005
Waves and Optics
Solution
A radio station broadcasts at a frequency of 400 kHz. If the speed of the wave is 3.0 \times10\(^{-8}\)ms\(^{-1}\), calculate the wavelength of the radio wave.
A
1.3 × 102m
B
3.0 × 102m
C
2.4 × 102m
D
5.0 × 102m
E
7.5 × 10-14m
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
To calculate the wavelength of a radio wave, we use the formula:
\(\lambda = \frac{v}{f}\)
where:
- \( v \) is the speed of the wave,
- \( f \) is the frequency.
Given:
- Frequency \( f = 400 \, \text{kHz} = 400 \times 10^3 \, \text{Hz} \)
- Speed \( v = 3.0 \times 10^{-8} \, \text{m/s} \)
Substituting the values into the formula:
\(\lambda = \frac{3.0 \times 10^{-8} \, \text{m/s}}{400 \times 10^3 \, \text{Hz}}\)
Calculating:
\(\lambda = \frac{3.0 \times 10^{-8}}{4.0 \times 10^5}\)
\(\lambda = 7.5 \times 10^{-14} \, \text{m}\)
Thus, the wavelength of the radio wave is:
\(\lambda = 7.5 \times 10^{-14} \, \text{m}\)
Source: Myschool Past Questions Archive (Record #43029)
Physics
NECO SSCE 2005
Waves and Optics
Which of the following is/are longitudinal wave(s)?
I. Light waves from the sun
II. Sound waves in the air
III. Waves on a vibrating string
A
I only
B
II only
C
I and II only
D
I and III only
E
II and III only
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #43030)
Physics
NECO SSCE 2005
Waves and Optics
Solution
Which of the following statements is/are correct? Sound waves travel through
I. air
II. vacuum
III.Water
A
II only
B
I and II only
C
II and III only
D
I and III only
E
I, II, and III
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Sound travels in air and water. However, in a vacuum, sound moves at 0 m/s. Hence, it doesn't travel in a vacuum.
Source: Myschool Past Questions Archive (Record #43032)
Physics
NECO SSCE 2005
Waves and Optics
Solution
The amplitude of oscillation of a simple pendulum bob diminishes slowly because
A
energy is applied by some external agencies
B
frictional forces dissipate the energy of motion
C
the frequency of oscillation increases with the mass of the bob
D
the frequency of oscillation varies with time
E
the period of oscillation varies with time.
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The amplitude and the frequency of an oscillating pendulum decrease gradually with time.
Source: Myschool Past Questions Archive (Record #43040)
Physics
WAEC / WASSCE 2005
Waves and Optics
Solution
Describe, with the aid of a diagram, how a wave can be plane polarized.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
(i) unpolarized wave (ii)
Planer Polarized Wave
Source: Myschool Past Questions Archive (Record #53823)
Physics
WAEC / WASSCE 2005
Waves and Optics
Solution
Explain wave-particle paradox
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
The wave particle paradox supposes that light exhibits wave properties such as reflection, diffraction, interference etc. and can also exist as a particle called photons. However light cannot behave as a wave and as particle at the same time.
Source: Myschool Past Questions Archive (Record #53840)
Physics
WAEC / WASSCE 2005
Waves and Optics
Solution
using the diagram above as a guide:
Trace the outline ABC of the equilateral triangular glass prism provided.
Remove the prism. Draw a line MN such that it makes an angle i = 5^\circ with the normal at N on side AB of the outline.
Fix two pins at \(P_1\) and \(P_2\) on MN. Replace the prism on its outline.
Looking through the face BC of the prism, fix one pin at \(P_3\) and another at \(P_4\) Such that they are in a straight line with the images of the pins at \(P_1\) and \(P_2\).
Remove the prism and the pins. Draw a line to join \(P_4\) and \(P_3\). Produce line \(P_4\)\(P_3\) to meet the line BC of the outline at CQ and line MN produced at P.
Draw a normal to BC at Q. Measure and record the angles \(\theta\) and e. Evaluate \(\phi\) = i + e.
Repeat the procedure, using a different outline in each case, for four other values of i = 100, 159, 20, and 25 respectively. Evaluate \(\phi\) =i + e in each case. Tabulate your readings.
Plot a graph of \(\theta\) on the vertical axis against \(\phi\) on the horizontal axis starting both axes from the origin (0,0).
Determine the slope of the graph and the intercept on the vertical axis.
State two precautions taken to ensure accurate results.
(b)i. Explain what is meant by the statement: the refractive index of glass is 1.5.
ii. Calculate the critical angle of a medium of refractive index 1.65 when light passes from the medium to air.
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Table of values / observation
S/N
L^\circ
e^\circ
\(\theta\)^\circ
\(\theta\) = i + e
1
5.0
5.0
130.0
10.0
2
10.0
10.0
140.0
20.0
3
15.0
15.0
150.0
30.0
4
20.0
20.0
160.0
40.0
5
25.0
25.0
170.0
50.0
7. Title: The graph of \(\theta\)^\circ vs \(\phi\)
Scale: \(\theta\)^\circ axis: 2cm = 20 units
\(\phi\) axis: = 2cm = 20 units
8. Slope/gradient = \(\frac{\bigtriangleup \theta ^\circ}{\bigtriangleup \phi ^\circ} = \frac{170-120}{50-0} = \frac{50}{50}\) = 1.0
Intercept on the vertical axis (I) = 120^\circ
9. Precautions are:
I ensured that the objective pins and the image pins were erect and in a straight line to avoid parallax error.
I ensured that the optical pins were reasonably separated.
I ensured that I used a sharp-pointed pencil to obtain neat traces.
I ensured that I look directly at the protractor scales when taking my readings to avoid parallax error.
(b)i. lt means that the ratio of the speed/wavelength of light in air to glass is 1.5. i.e,
n \(\frac{\text {Speed/wavelength in air}}{\text {speed/wavelength in glass}}\) = \(\frac{3}{2}\) = 1.5 pin
ii. \(_{a}\)\(n_g\) = \(\frac{1}{\text {sin c}}\), 1.65 = \(\frac{1}{\text {sin c}}\)
= Sin C = \(\frac{1}{1.65}\) = 0.6060
C = sin\(^{-1}\) (0.6060), C = 37.3^\circ
Source: Myschool Past Questions Archive (Record #60077)
Physics
UTME / JAMB 2004
Waves and Optics
Solution
In a tuned radio receiver R, L, C series circuit for resonance, the inductive and capacitive reactance XL and XC respectively are related as
A
XL = XC
B
XL = 1/2XC
C
XL = 1/XC
D
XL = 2XC
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
In an R - L - C circuit resonance occurs when the inductive reactance (XL), is equal to the capacitive reactance (XC)
1.e XL = XC
Source: Myschool Past Questions Archive (Record #12795)