What is the number of different wavelengths in the emission spectrum of this atom?
The position below which radioactive decay cannot occur
The region in which fission is most likely to occur
The position where the most stable nuclides are found
The region in which fusion is most likely to occur
What activity is detected after 36 hours?
The average binding energy per nucleon of the nucleus is 7.5 MeV. What is the total energy required to separate the nucleons of one nucleus of ?
What is this particle?
Z → Y → X
Z → X → Y
Y → X → Z
X → Z → Y
Bismuth-210 is a radioactive isotope that decays as follows.
time taken for one atom to undergo decay.
probability for `N/2` atoms to undergo decay.
time taken for `N/2` atoms to undergo decay.
probability that one atom will decay per unit time.
Which of the following is true about beta minus (β−) decay?
An antineutrino is absorbed.
The charge of the daughter nuclide is less than that of the parent nuclide.
An antineutrino is emitted.
The mass number of the daughter nuclide is less than that of the parent nuclide.
It is at the centre of the atom.
It is surrounded by orbiting electrons.
It is made of protons and neutrons.
It is a small region of the atom and is positively charged.
The nuclear reaction would best be described as
The mass of one atom of hydrogen.
1/12 of the mass of an atom of carbon -12.
The mass of one atom of carbon-12.
1/16 of the mass of an atom of oxygen -16.
The mass of the sample
The temperature of the sample
The volume of the sample
The pressure acting on the sample
One α particle and two β− particles are emitted during the sequence. Which statement is correct?
Nucleus P has the same number of neutrons as nucleus Q.
Nucleus P is an isotope of nucleus Q.
Nucleus P has a greater charge than nucleus Q.
Nucleus P has fewer protons than nucleus Q.
Which of the following correctly identifies the three particles emitted in the decay of the nucleus into a nucleus of
`α, β^−, γ`
`α, β−, narnu`
The rest mass of a proton is 938 MeVc−2. The energy of a proton at rest is
the existence of discrete atomic energy levels.
the existence of the neutron.
a dense positively charged nucleus.
the stability of some nuclei.
the nuclear model of the atom.
the existence of isotopes.
the existence of atomic energy levels.
What are the axis labels for this graph?
is an example of
When an alpha particle collides with a nucleus of nitrogen-14 a nucleus X can be produced together with a proton. What is X?
The binding energy per nucleon of What is the energy required to separate the nucleons of this nucleus?
A radioactive sample has activity A0 at t=0. What will be the activity of the sample after two half-lives?
less than `A_0/4` if the sample is kept at high pressure
greater than `A_0/4` if the sample is kept at high temperature
Element X decays through a series of alpha (α) and beta minus (β–) emissions. Which series of emissions results in an isotope of X?
1α and 2β–
1α and 4β–
2α and 2β–
2α and 3β–
Which Feynman diagram shows beta-plus (β+) decay?
I. strong nuclear
II. weak nuclear
What forces are experienced by an electron?
I and II only
I and III only
II and III only
I, II and III
electromagnetic, gravity, strong nuclear
weak nuclear, gravity, strong nuclear
gravity, weak nuclear, electromagnetic
electromagnetic, strong nuclear, gravity
The mass defect for deuterium is 4×10–30 kg. What is the binding energy of deuterium?
9.38 × (3 × 108)2 × 106 J
9.38 × (3 × 108)2 × 1.6 × 10–19 J
9.38 × 108 × 1.6 × 10–19 J
α-particles have discrete amounts of kinetic energy.
most of the mass and positive charge of an atom is concentrated in a small volume.
the nucleus contains protons and neutrons.
gold atoms have a high binding energy per nucleon.
The binding energy per nucleon of a nucleus is 3 MeV. What is the minimum energy needed to
completely separate the nucleons of .
The half-life of X is `T_(1/2).` After a time equal to 4 half-lives of X the ratio
What is the half-life of Y?
The number of neutrons and the number of protons in a nucleus of an atom of the isotope of uranium are
`1/12` the mass of a neutral atom of carbon-12
The mass of a neutral atom of hydrogen-1
`1/12` the mass of a nucleus of carbon-12
The mass of a nucleus of hydrogen-1