Revision/ Ch 10/ Q9
Q1
(a) If the wavelength of an electron is 5.00 ´ 10- 7 m, how fast is it moving?
(b) If the electron has a speed equal to 1.00 ´ 107 m/s, what is its wavelength?
(a) If the wavelength of an electron is 5.00 ´ 10- 7 m, how fast is it moving?
(b) If the electron has a speed equal to 1.00 ´ 107 m/s, what is its wavelength?
[1.46 km s-1, 7.28 ´
10-11 m]
Q2
Calculate the de
Broglie wavelength of a proton moving at
(a) 2.00 ´ 104 m/s and
(b) 2.00 ´ 107 m/s.
Q3
(a) 2.00 ´ 104 m/s and
(b) 2.00 ´ 107 m/s.
Q3
The resolving
power of a microscope is proportional to the wavelength used. A resolution of
1.0 ´ 10– 11 m (0.010 nm) would be
required in order to “see” an atom.
(a) If electrons were used (electron microscope), what minimum kinetic energy would be required of the electrons?
(a) If electrons were used (electron microscope), what minimum kinetic energy would be required of the electrons?
(b) If photons were used, what minimum photon energy would be needed to obtain 1.0 ´ 10– 11 m resolution?
[15 keV, 1.2 ´ 102 keV]
thank you sir for your efforts
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