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Physics
UTME / JAMB 2008
Structure of the Atom
Solution
If electron are accelerated from rest through a potential difference of 10kv, what is the wavelength of the associated electron?
[m = 9.1 x 10\(^{-31}\)kg, e = 1.6 x 10\(^{-19}\)C, h = 6.6 x 10\(^{-34}\)js]
A
1.22 x 10-11m
B
3.87 x 10-10m
C
2.27 x 1011m
D
2.27 x 1014m
medium Difficulty
Study Explanation
Physics
UTME / JAMB 2004
Structure of the Atom
Solution
X rays can be used in the study of crystal structure because they
A
have a very long-reaching wavelength
B
have extremely short wavelength
C
are invisible
D
are very fast
medium Difficulty
Study Explanation
Physics
UTME / JAMB 2004
Structure of the Atom
Solution
Flourescent tubes produces light by the
A
excitation of gas molecules
B
conduction of solar energy
C
refraction of light by gas molecules
D
thermal agitation of electron in the tubes
medium Difficulty
Study Explanation
Physics
WAEC / WASSCE 2002
Structure of the Atom
Solution
In a model of the hydrogen atom, the energy levels Wn are given by the formula Wn = -\(\frac{R}{n^2}\), where n is an integer and R is a constant. Determine the energy released in the transition from n = 3 to n = 2.
A
\(\frac{R}{5}\)
B
-\(\frac{R}{4}\)
C
\(\frac{5R}{36}\)
D
\(\frac{-5R}{36}\)
medium Difficulty
Study Explanation
Physics
UTME / JAMB 2000
Structure of the Atom
Solution
If the frequency of an emitted x-ray is 1.6 x 10\(^{16}\)Hz, the accelerating potential is?
[e = 1.6 x 10\(^{19}\)C, h = 6.63 x 10\(^{-34}\)Js]
A
6630.0V
B
663.0V
C
66.3V
D
6.6V
medium Difficulty
Study Explanation
Physics
UTME / JAMB 1987
Structure of the Atom
Solution
Which of the following statements is TRUE of photoelectric effect?
A
it cannot occur in liquids
B
the energy of the emitted electrons is independent of the work function of the surface
C
the energy of the emitted electron depends on the wavelength of the incident light
D
the greater the intensity of the incuident light, the greater the incident of the emitted electron
medium Difficulty
Study Explanation
Physics
UTME / JAMB 1980
Structure of the Atom
Solution
Which of the following statements on the use of X-rays is incorrect? X-rays are used
A
in hospitals to obtain photogaphs of tissues and bones in the body
B
for the treatment of malignant growths like cancer cells
C
in detecting fingerprints
D
to reveal hidden flaws in metal castings and welded joints
E
to detect alternations which have been made to works of art
medium Difficulty
Study Explanation