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NCERT Exemplar Solutions Class 7 Science Solutions for Transportation in Animals and Plants - Exercise in Chapter 11 - Transportation in Animals and Plants
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Observe Figure 11.2 and answer the given questions:
(a) Name the instrument.
(b) Label the parts A, B and C.
Answer:
a) The given instrument is stethoscope
b)
Video transcript
"hello everyone welcome to later this is
priya
and here we have a question about
calculating the percentages of
different isotopes so let us read the
question
the average atomic mass of a sample of
an atom
element is 16.2 mu
what are the percentages of isotopes
8x16 and 8x18
in the sample so what we know is
so when we do the average of these two
at uh
elements we'll get a percentage of
100 so let
percentage let percentage
of atomic element with
atomic mass 16 be
a so we are just taking the first
element first isotope as a and
that of the next
isotope x with 6
18 mass b 100 minus
a as per given data
we know the average of these two will be
16.2
nu so equal to so as we know the formula
of
uh finding the average atomic mass so it
is 16
a by 100 plus
18 100 minus
a by 100 so if we simplify
this we'll get 16 a
plus 1800
minus 18 a
by 100 so
if these hundred comes to the rhs
it will be 1620
equal to
1800 minus
this and this will subtract will get 2 8
okay i'm grabbing a little bit
so the next step is
to simplify this one so 2
a equal to
if we subtract this and this 1800 minus
16
120 will get 90 per
90. we will subtract this
1800 minus 16 20
will get 0 8
180 so we get 180
and that implies a equal to 180 by 2
it is 90 so the
first percentage of this isotope is 90
and the remaining percentage so if from
the now from the
900 if we subtract the 90 we will have
10 10 so the second element has the
percentage of
10 first element has percentage of
90 so this is about the question
hope you understand this video if you
like my video please subscribe to our
little channel
and if you have any doubts you can keep
a message in comment box thank you"
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