Worksheetsphysics form 5 chapter 6-Nuclear Physics
Total questions: 20
Worksheet time: 15mins
a radioactive decay is random and spontaneous because
it is not influenced by temperature, pressure and other physical factors
it is influenced by temperature, pressure and other physical factors
it can change to other elements
it can happen anywhere
alpha particles is a helium nucleus consists of
2 protons and 2 neutrons
4 protons and 2 neutrons
2 protons and 4 neutrons
2 protons and 4 electrons
during beta decay, a neutron decomposes into
1 proton and 1 electron
1 proton
1 electron
a new element
choose the wrong statement
'Gamma rays are .....'
low frequency electromagnetic wave
rays with no mass
neutral
not charged
time taken for a sample of a radioactive nuclei to decay to half of its initial number is the definition for...
half-life
radioactive decay
chain reaction
period of a nucleus
this reaction is called
nuclear fission
nuclear fusion
radioactive decay
decomposition of nucleus
this reaction is called..
nuclear fusion
nuclear fission
radioactive decay
decomposition of nucleus
the control rod in a nuclear reactor functions to
absorb excess neutrons
slow down the neutrons
absorb heat energy
cool down the reactor
the mass defect in a nuclear reactions is 2 x 1020 kg. What is the energy released in Joule?
1.8 x 10-3
1.8 x 10-10
6.0 x 10-10
6.0 x 10-3
the half-life of a radioactive substance is 3 days. How much time is required for 10 g of the substance to decay until 1.25 g is left?
9 days
3 days
6 days
12 days
the source of energy from the sun is due to
nuclear fusion
nuclear fission
combustion
radioactive decay
What is the energy released when there is mass defect of 0.01g?
9 x 1011 J
9 x 1014 J
3 x 106 J
1 x 10-19 J
In a nuclear reaction, 5.265 x 10-10 J of energy is released. What is the mass defect of this reaction in kg?
5.85 x 10-27
4.74 x 107
1.76 x 10-18
1.58 x 10-2
the function of graphite in a nuclear reactor is to
slow down neutrons
acts as a catalyst
absorb heat produced
conduct electricity
2.69 x 10-12 J
2.69 x 10-11 J
3.22 x 10-11 J
3.22 x 10-12 J
Of the main types of radiation emitted from naturally radioactive isotopes, which is the hardest to block?
Alpha deca
Gamma Decay
Beta decay
They are all blocked using the same method
Calculate the energy produced in Joule.
(1 u = 1.66 x 10-27 kg)
( c = 3 x 108 m/s)
2.98 x 10-11
2.98 x 10-12
1.15 x 10-11
1.15 x 10-12
What is the mass defect?
0.005 u
0.05 u
0.004 u
0.04 u
What is the radioisotope used to determine the age of a fossil?
Carbon-14
Iodine -131
Americium-241
Uranium-238
the half-life or arsenic is 18 days. A sample contains a certain amount of arsenic. After 72 days, only 5 g of the arsenic still remains. What is the initial mass of the arsenic?
80 g
160 g
90 g
72 g
