T and the halflife of Y is 3 T After a time of 3 T the ratio of the amounts of X to Y is A 8 B 4 C 14 D 18 The process by which a heavy nucleus splits into two lighter nuclei is known ID: 564895
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Slide1
Slide2
Two samples of radioactive substances X and Y have the same initial activity. The half-life of X is T
and the half-life of Y is 3T. After a time of 3T the ratio of the amounts of X to Y is
A.
8.B. 4.C. 1/4.D. 1/8.Slide3
The process by which a heavy nucleus splits into two lighter nuclei is known
as
fission
.
fusion.
radioactive
decay.
D
. artificial (induced) transmutation.Slide4
Radium-226 decays with the emission of α-particles to radon (Rn
).Complete the nuclear reaction equation.Slide5
Which of the following provides evidence for the existence of atomic energy levels
?
The
absorption line spectra of
gases
B. The
existence of isotopes of elements
C. Energy
release during fission reactions
The
scattering of α -particles by a thin
metal
filmSlide6
The mass of a nucleus of rutherfordium-254 is 254.1001 u.
Calculate
the mass in GeV c–2.236.7Slide7
Nuclide X has a half-life of 1 day and nuclide Y has a half-life of 5 days. In a particular sample, the activities of X and Y are found to be equal.
When the activity is tested again after 10 days, the activity will be:A. entirely due to nuclide X.B. due equally to nuclides X and Y.
C. mostly due to nuclide X.
D. mostly due to nuclide Y. Slide8
Total mass
Total binding energy
A.
Mf > Mi
Ef < Ei
B.
Mf > Mi
Ef > Ei
C.
Mf < Mi
Ef < Ei
D.
Mf < Mi
Ef
>
Ei
In a fission reaction, the total mass and the total binding energy before the reaction are
Mi
and
Ei
respectively, where the binding energy is defined as a positive quantity. After the reaction the total mass is
Mf
and the total binding energy is
Ef
. Which of the following correctly compares the total masses and the total binding energies?Slide9
A nucleus of thallium-206 (Tl-206) undergoes radioactive decay to a nucleus of lead-206 (Pb-206). In the reaction equation below, identify the proton number
Z
of lead and the particle x.
Z
: 18 or 20;
x
:
neutrino/antineutrino
;Slide10
The Geiger-Marsden alpha particle scattering experiment provides evidence for the existence
of
A. atomic nuclei.
B. neutrons.
C. protons.
D. nuclear energy levels.Slide11
Slide12
Slide13
Slide14
The main source of the Sun’s energy
is
A. chemical reaction.
B. natural radioactivity.
C. nuclear fusion.
D. nuclear fission.Slide15
The relationship between proton number
Z
, neutron number N and nucleon number
A
is
A.
A
=
Z – N
.
B.
Z
=
A
+
N
.
C.
N
=
A
–
Z.D. N = A +Z.Slide16
Slide17
A radio-isotope has an activity of 400
Bq
and a half-life of 8 days. After 32 days the activity of the sample is
A. 200
Bq
.
B. 100
Bq
.
C. 50
Bq
.
D. 25
Bq
.Slide18
Calculate the number
x
of neutrons produced.3Slide19
Calculate the energy, in eV, of a photon of light of wavelength 490 nm.
2.5
eVSlide20
The binding energy of a nucleus is defined to be
the
energy
released when a nucleus is formed from its individual constituents
.
energy
released when the nucleus is separated into its individual constituents
.
total
energy of the nucleus
.
D. total
energy of the protons inside the nucleus.