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Quick Quiz On Particles
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Menu]
Give all answers to
3s.f. unless otherwise asked.
h = 6.63*10-34 Js c = 3*108
m/sec e = -1.6*10-19 c
1. How many
quarks are there in a single nucleon? Give answer as an integer.
quarks
2. An electron
and a positron meet and annihilate.
(a)
Calculate the maximum wavelength of the gamma ray emitted.
x10-12
m
(b) If the
binding energy per nucleon of 56Fe is 8.80Mev calculate what
fraction of a proton mass this total energy is.
3. If the
mass of a proton is 1.67 * 10-27kg ,
(a)
calculate its rest energy in MeV.
MeV
(b) If the
proton is accelerated through a potential difference of 2000volts, calculate
its speed in m/sec.
x
105m/sec
4. A cyclotron
is used to accelerate subatomic particles by making them follow a circular
path of increasing radius.
(a)
What is the frequency of revolution (in MHz) for a proton in a magnetic
field of 0.25Tesla?
MHz
(b) Repeat
for an alpha particle.
MHz
5. How many
different 'flavours' of quarks are there ?Give answer as an integer.
flavours
6. An electron
is accelerated so that it achieves a total energy of 5 times its rest mass-energy.
(a)
What fraction of the speed of light is this ?
fraction
of c
(b) What
is the speed in m/sec ?
x108
m/sec
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