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WorksheetsFIVIZZ: WEEK 4 - PHYSICS 3
Total questions: 10
Worksheet time: 1hrs 4mins
Calculate the de Broglie wavelength of an electron moving at 3.0x107 ms-1 given that the mass of the electron is 9.11x10-28 g.
2.24 x 10-13 m
2.43 x 10-14 m
2.43 x 10-11 m
2.24 x 10-16 m
Calculate the binding energy per nucleon of zirconium-97 in Joule per nucleon.
no. of proton: 40
proton mass: 1.00728 u
neutron mass: 1.00867 u
mass of zirconium-97 nucleus: 97.09801 u
1 MeV = 1.6x 10-13 J
6.60
1.056 x 10-12
1.056 x 10-18
The activity of a radioactive source X falls from 5.0 x 1010 Bq to 1.0 x 1010 Bq in 5.0 hours. Calculate the half-life.
*Give the answer in two-decimal places. Do key-in the answer the same way as shown in this example:
1.23 hours
(a)
Electromagnetic radiation of frequency 3.0x1015 Hz is incident on the surface of sodium metal. The emitted photoelectrons have a maximum kinetic energy of 1.6x10-18 J. Calculate the threshold of frequency for photoemission from sodium.
Do key-in the answer the same way as shown in this example: 1.23E45 Hz
(a)
What is conserved in nuclear reaction?
The total amount of charges(Z) before and after reaction.
The total amount of masses(A) before and after reaction.
Total kinetic energy before and after reaction
Momentum before and after reaction
Given that the atomic mass of Krypton-92 is 91.92615u and the atomic mass of Beryllium-9 is 9.01219u, which one is more stable?
mass of proton= 1.007276u
mass of neutron= 1.008665u
mass of electron= 0.000548u
proton number of Krypton-92= 36 protons
proton number of Beryllium-9= 4 protons
(15 minutes are given for this question.)
Krypton-92
Beryllium-9
both are the same
A sodium surface is illuminated with light of wavelength 0.300 µm. The work function for sodium is 2.46 eV. Find the maximum kinetic energy of the photoelectrons.
1.68 eV
1.54 x 1019 eV
-2.46 eV
1.68 MeV
Find the number of A and Z of the nuclide Y.
A = 218
A = 215
Z = 67
Z = 73
Calculate the activity of 6.7x1021 atoms of strontium-90.
(decay constant of strontium-90 = 8.3x10-10s-1)
Do key-in the answer in the same way as the example given: 1.234E56 Bq
(a)
Which one emit a pair of identical photon?
Stimulated absorption
Stimulated emission
Spontaneous emission
