1. when a wave moves from a less dense medium to a denser one,
most of the wave energy is refracted.
true
2. the loudness of a sound is the wave's amplitude
true
3. a crest in a transverse wave corresponds to a
compression
4. a ________________ in a transverse wave corresponds to a
compression in a longitudinal wave
crest
5. when the source of a sound is moving its speed increases
true
6. for a stationary observer, when the source of a sound is
moving, its pitch appears to change.
true
7. _______________ interference occurs when two waves are out of
phase.
destructive
8. a trough in a transverse wave corresponds to a
rarefaction in longitudinal
wave
9. what is the mass number of the particle emitted from the
nucleus during beta minus
9.11 ×10-31kg
10. what kind of charge does an alpha particle have
+2 , two positive charge
11. what particle is associated with beta decay
electron or negatron
12. beta particle identity is
0-1e, zero mass and a single
negative charge, diffracted to the positive pole in electric field.
13. when an alpha particle is lost from an atom where on the
periodic table would you find the product
2 places below the parent
atoms
14. how does the law of conservation of matter explain how you write
nuclear equations
the total mass number on the
left hand side must be equal to the total mass number on the right hand side
the atomic number or nuclear charge on the
left hand side must be equal to that on the right hand side
total momentum is conserved
15. if an atom of element number 85 astatine undergoes alpha decay
what atom will be produced
the product is bismuth, two
proton and neutrons is lost as alpha
particles
16. which isotopes are most likely to decay faster.
a) uranium-235
b) Oxygen-18
c) carbon-14
d) nitrogen-14
17. does the identity of the atom change during radioactive decay
yes, alpha, beta, and
positron decays will changes the identity of the atom, while gamma decay wont,
alpha decay creates an daughter atoms, with atomic 2-postion less than the
parent in PT. beta minus creates and isobars
with atomic number higher than the parent by one, while beta plus is less by
one.
18. explain how you figured out how many neutrons an isotope has
you subtract the atomic
number from the mass number, and
19. what is the mass number of the particle emitted from the nucleus
during beta minus decay
the mass number of the
daughter atom in every beta minus decay does not change, only the atomic number
increases by one.
20. what kind of charge does an alpha particle have
plus two ,+2
21. if a francium atom element 87 undergoes beta decay what type of
atom will be produced
radium,with Z=88,
22. why do you think the alchemists were not successful in making
gold from other metals
THEY DON’T know nuclear
physics
23. does the identity of the atom change during radioactive decay
it does, when new atomic
number is from then the identity changes
24. write an equation representing alpha decay in a possible isotope
of es einsteinium
252 99Es → 4 2He + 248 97Bk
25. describe four processes that result in new elements being formed
radioactivity: is the
pontaneous decay of unstable atoms
nuclear fission: is the
splitting of larger atoms into smaller atoms
nuclear fusion is the
combination of two smaller atoms to form new larger atom
nuclear synthesis : The
synthesis of precious metals is the use of either nuclear reactors or particle
accelerators to produce these elements
26. an alpha particle is not a neutral atom. it has a charge of +2.
why is this the case?
alpha particle is nucleus of
helium atom, it is not neutral atom
because it loses two electrons, that will otherwise
27. what is the identity of an alpha particle
4 2He, symbol of helium,
mass= 4 and charge +2
28. explain why the mass number of an atom does not change when a
beta particle is emitted
when a beta particle is
emitted, a neutron is converted to a proton and an electron neutrino, the
atomic number increases while total number of nucleon does not change( the
proton replaces the neutron lost) this is why mass number( number of protons
and neutron) does not change.
29. if an atom of element number 85 astatine undergoes alpha decay
what atom will be produced
bismuth will be formed
30. which of the following symbols represent a positron? check all
that apply.
+0e
31. when an alpha particle is lost from an atom where on the
periodic table would you find the product
two places below the position
of the parent atom.
32. explain how you figured out how many neutrons an isotope has
we substract the atomic number
Z from the mass number A, to get N, N
=A-Z
33. what is the mass number of the particle emitted from the nucleus
during beta minus decay
SAME AS MASS OF ELECTRON
34. what kind of charge does an alpha particle have
positive charge
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