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Physics
WAEC / WASSCE 2009
Waves and Optics
Solution
An electron of mass 9.1 x 10-31 kg moves with a speed of 107ms-1. Calculate the wavelength of the associates wave[h = 6.6 x 10-34Js]
A
9.0 x 10-24m
B
4.55 x 10-17m
C
7.25 x 10-11m
D
6.20 x 10-8m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\lambda = \frac{hc}{\frac{1}{2}mv^2}\)
= \(\frac{6.6 x 10^{-34} \times 3 \times 10^8}{0.5 \times 9.1 \times 10^{-3} (10^7)^2}\)
= 7.25 x 10-11m
Source: Myschool Past Questions Archive (Record #35221)
Physics
UTME / JAMB 2009
Waves and Optics
Solution
A progressive wave is represented by \( y = 10 \text{Sin} (1000\pi t - \frac{\pi x}{34}) \) . two layers of the wave separated by 153cm have a phase difference of?
A
2700
B
450
C
900
D
1800
E
No Correct Option
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Comparing \( y = 10 \text{Sin} (1000\pi t - \frac{\pi x}{34}) \) with y = A sin (\omegat - ϕ)
where ϕ = \(\frac{2\pi x}{\lambda}\)
comparing: \(\frac{2\pi x}{\lambda}\) = \( \frac{\pi x}{34}\)
\lambda = 34 \(\times\) 2 = 68
: ϕ = \(\frac{2\pi x}{\lambda}\) = \(\frac{2\pi \times 153}{68}\)
ϕ = 4.5\(\pi\) rad = 810^\circ or 90^\circ
since sin 810^\circ or 90^\circ = 1
Source: Myschool Past Questions Archive (Record #41400)
Physics
NECO SSCE 2009
Waves and Optics
The defect of the eye lens which occurs as a result of weak ciliary muscles is called
A
astigmatism
B
hypermetropia
C
myopia
D
presbyopia
E
spherical aberration
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 #43050)
Physics
NECO SSCE 2009
Waves and Optics
Which of the following pairs of phenomena helps in the resolution of the wave-particle paradox of matter?
A
Compton effect and thermionic emission
B
Electron diffraction and refraction
C
emission and absorption of light
D
Interference and polarization
E
Reflection and photoelectric effect
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 #43051)
Physics
NECO SSCE 2009
Waves and Optics
Solution
A plane progressive wave is represented by the equation y = 0.2sin (200\pit - 0.5.x) where x and y are measured in cm and t in s. What is the frequency of the wave?
A
0.5Hz
B
4.0Hz
C
10.0Hz
D
100.0Hz
E
200.0Hz
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Comparing y = 0.2sin (200\pit - 0.5.x) with the general equation of wave y = Asin(\omegat - kx)
\omega = 200\(\pi\)
But \omega = 2\(\pi\)f = 200\(\pi\)
f = \(\frac{200\pi}{2\pi}\) = 100Hz
Source: Myschool Past Questions Archive (Record #43054)
Physics
NECO SSCE 2009
Waves and Optics
A stone is thrown with a speed of 10ms at an angle of 30° to the horizontal, Calculate its time of flight, (g = 10ms2)
A
0.5s
B
1.0s
C
1.7s
D
2.0s
E
3.4s
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 #43055)
Physics
NECO SSCE 2009
Waves and Optics
Two images Y and X are formed by a plane mirror and a convex mirror respectively. Which of the following is correct about their characteristics?
A
Both are inverted
B
The magnification of Y is greater than one while that of X is one
C
The magnification of Y is one while that of X is less than one
D
Y is inverted while X is erect
E
Y is real while X is virtual.
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 #43062)
Physics
NECO SSCE 2009
Waves and Optics
A sound wave from a ship is received 8.4s later. What is the depth of the sea? [Speed of sound in water 1500ms-1]
A
0.179km
B
0.357km
C
3.150km
D
6.300km
E
12.600km
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 #43074)
Physics
NECO SSCE 2009
Waves and Optics
Which of the following statements is correct about light and sound waves? Both
A
are longitudinal waves
B
are transverse waves
C
have the same velocity in air
D
need a medium for propagation
E
transmit energy
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 #43079)
Physics
NECO SSCE 2009
Waves and Optics
Which of the following pairs of musical instruments produce sound due to the vibration of air column?
A
Bell and piano
B
Guitar and flute
C
Trumpet and drum
D
Trumpet and flute
E
Violin and organ
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 #43080)
Physics
WAEC / WASSCE 2009
Waves and Optics
Solution
Give three observations in support of de Broglie's assumption that moving particles behave like waves
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
- Moving electrons exhibits wavelength/frequency
- electrons show refraction
- electrons show reflection
- electrons show interference
- electrons show diffraction patterns
Source: Myschool Past Questions Archive (Record #53511)
Physics
WAEC / WASSCE 2009
Waves and Optics
Solution
State three methods of polirizing an unpolarized light
medium Difficulty
Verified Correct Answer: Option
Physical Principles & Numerical Solution
Method of polarizing an unpolarized light;
- by reflexion
- by double refraction
- selective absorption by crystals
- polarizing by pile of plates
- passing unpolarised light through a polariod
Source: Myschool Past Questions Archive (Record #53513)
Physics
UTME / JAMB 2008
Waves and Optics
Solution
Given the progressive wave equation y = 5 sin (2000 \pit - 0.4x), calculate wave length
A
12.4 m
B
15.7 m
C
17.5 m
D
18.6 m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Comparing y = 5sin (200 \pit - 0.4X) with the wave equation y = A sin (wt -KX) K = (2\pi)/\lambda = 0.4
∴ \lambda = (2\pi)/0.4 = 15.7M
Source: Myschool Past Questions Archive (Record #14045)
Physics
UTME / JAMB 2008
Waves and Optics
Diagram
Solution
The above figure shows the motion of a progressive wave along a string. The particle motion of the medium is in direction?
Attached Figure / Diagram
A
parallel to OX
B
parallel to OY
C
60o to OX
D
60v to OY
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Particles of the transmitting medium in transverse wave oscillate in a direction perpendicular to the propagation of the wave
Particle motion of a string (transverse wave) is parallel to OY (or perpendicular to OX)
Source: Myschool Past Questions Archive (Record #14489)
Physics
WAEC / WASSCE 2008
Waves and Optics
Light is considered as a transverse wave because it travels
A
through material without causing disturbance of the medium
B
through space with constant speed
C
in a direction parallel to the plane containing the electric and magnetic fields
D
in a direction perpendicular to the plane containing the electric and magnetic fields
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 #35055)