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Likurg_2 [28]
3 years ago
7

All combinations of possible symmetry elements (and some single elements) are referred to six crystal systems. Which are these s

ix?
Geography
1 answer:
timurjin [86]3 years ago
3 0

Answer:

<u>There are a total six crystal system like triclinic, monoclinic, tetragonal, hexagonal, orthorhombic and cubic</u>.

Explanation:

  • The crystal forms of the crystal family refer to several classes of crystals that are informally formed by the grouping of crystal and being divided based on sources.
  • The crystal; system that corresponds to space groups is given a lattice system giving them a 32 point scale.
  • These points are assigned to the trigonal crystal system which consists of all the above 6 system forms of crystals.
  • Their name is given by Whittaker who formed these crystal structures as protein structures
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Explanation:

34+10.9=44.9

118+80.3=198.3

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3 years ago
Calculate the amount, in grams, of an original 300-gram sample of radioactive isotope Potassium-40 remaining after
Aleksandr [31]

Answer:

The current amount of the Potassium-40 sample is approximately 37.521 grams.

Explanation:

The amount of the sample of the radioactive isotope decays exponentially in time, the amount of mass of the sample as a function of time (m (t)), in grams, is described below:

m(t) = m_{o}\cdot e^{-\frac{t}{\tau} } (1)

Where:

m_{o} - Initial mass, in grams.

t - Time, in years.

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The time constant can be found from half life (t_{1/2}), in years, described in statement:

\tau = \frac{t_{1/2}}{\ln 2} (2)

If we know that m_{o} = 300\,g, t = 3.9\times 10^{9}\,yr and t_{1/2} = 1.3\times 10^{9}\,yr, then the current amount of the sample is:

\tau = \frac{1.3\times 10^{9}\,yr}{\ln 2}

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The current amount of the Potassium-40 sample is approximately 37.521 grams.

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