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Physics-

General

Easy

Question

Radiocarbon dating is done by estimating in specimen the

Amount of ordinary carbon still present
Amount of radiocarbon still present
Ratio of amount of $^{14} C_{6} t o^{12} C_{6}$ still present
Ratio of amount of $^{12} C_{6} t o^{14} C_{6}$ still present

The correct answer is: Ratio of amount of $blank to the power of 14 end exponent C subscript 6 end subscript t o blank blank to the power of 12 end exponent C subscript 6 end subscript$ still present

Radiocarbon dating relies on a simple natural phenomenon. As the earth’s upper is bombarded by cosmic radiation, atmospheric nitrogen is broken down into an unstable isotope of carbon-carbon (C-14).
The unstable isotope is brought to earth by atmospheric activity, such as storms, and becomes fixed in the biosphere. Because it reacts identically to C-12 and C-13, C-14 attached to complex organic molecules through photosynthesis in plants and becomes their molecular makeup. Animals eating those plants in turn absorb carbon $negative 14$ as well as stable isotopes. This process of ingesting $C minus 14$ continues as long as the plant or animal remains alive.
The $C minus 14$ within an organism is continually decaying into stable carbon isotopes, but organism is absorbing more $C minus 14$ during its life, the ratio of $C minus 14$ to $C minus 12$ remains about same as the ratio in the atmosphere. Where the organism dies, the ratio of C-14 within its carcass begins to gradually decrease.

Related Questions to study

If the decay constant of a radioactive substance is $lambda$ , then its half-life is

If the decay constant of a radioactive substance is $lambda$ , then its half-life is

Physics-General

Which one of the following statement is true, if half-life of a radioactive substance is 1 month?

Which one of the following statement is true, if half-life of a radioactive substance is 1 month?

Physics-General

Two nuclei have their mass numbers in the ratio of 1:3. The ratio of their nuclear densities would be

Two nuclei have their mass numbers in the ratio of 1:3. The ratio of their nuclear densities would be

Physics-General

parallel

The above is a plot of binding energy per nucleon $E subscript b end subscript comma$ against the nuclear mass $M semicolon blank A comma blank B comma blank C comma blank D comma blank E comma blank F$ correspond to different nuclei. Consider four reactions $A plus B blank rightwards arrow C blank plus blank epsilon$ $C blank rightwards arrow blank A plus B plus blank epsilon$ $D plus E rightwards arrow blank F blank plus blank epsilon$ $F rightwards arrow D plus E plus epsilon$ where $epsilon$ is the energy released? In which reaction is $epsilon$ positive?

The above is a plot of binding energy per nucleon $E subscript b end subscript comma$ against the nuclear mass $M semicolon blank A comma blank B comma blank C comma blank D comma blank E comma blank F$ correspond to different nuclei. Consider four reactions $A plus B blank rightwards arrow C blank plus blank epsilon$ $C blank rightwards arrow blank A plus B plus blank epsilon$ $D plus E rightwards arrow blank F blank plus blank epsilon$ $F rightwards arrow D plus E plus epsilon$ where $epsilon$ is the energy released? In which reaction is $epsilon$ positive?

Physics-General

Fe(OH)₃ can be separated from Al(OH)₃ by addition of

Fe(OH)₃ can be separated from Al(OH)₃ by addition of

Chemistry-General

Which of the following elements (M) reacts with HNO₃ to form MO₂?

Which of the following elements (M) reacts with HNO₃ to form MO₂?

Chemistry-General

parallel

An acidic solution contains Cu²⁺, Pb²⁺ and Zn²⁺. If H₂S_(g) is passed through the solution the precipitate will contain

An acidic solution contains Cu²⁺, Pb²⁺ and Zn²⁺. If H₂S_(g) is passed through the solution the precipitate will contain

Chemistry-General

In all the oxyacids of phosphorus, each phosphorus atom is in sp³ hybrid state, i.e., it is tetrahedrally bonded to neighbouring four atoms. All these acids contain P - OH bonds, the hydrogen atom of which are ionisable imparting acidic nature to the compound. The ous acids (oxidation state of P = +1 or +3) also have P - H bonds in which hydrogens are not ionisable (P and hydrogen have nearly same electronegativity). The presence of P - H group in these acids imparts reducing properties. The structure of the various acids are drawn below (note that the tetrahedral shape of phosphorus is not shown only for convenience of representation).

There is very little difference in acid strength in the series H₃PO₄, H₃PO₃ and H₃PO₂ because

In all the oxyacids of phosphorus, each phosphorus atom is in sp³ hybrid state, i.e., it is tetrahedrally bonded to neighbouring four atoms. All these acids contain P - OH bonds, the hydrogen atom of which are ionisable imparting acidic nature to the compound. The ous acids (oxidation state of P = +1 or +3) also have P - H bonds in which hydrogens are not ionisable (P and hydrogen have nearly same electronegativity). The presence of P - H group in these acids imparts reducing properties. The structure of the various acids are drawn below (note that the tetrahedral shape of phosphorus is not shown only for convenience of representation).

There is very little difference in acid strength in the series H₃PO₄, H₃PO₃ and H₃PO₂ because

Chemistry-General

If $l subscript r end subscript superscript 2 end superscript plus m subscript r end subscript superscript 2 end superscript plus n subscript r end subscript superscript 2 end superscript equals 1$ where r = 1, 2, 3 and $I subscript 1 end subscript I subscript 2 end subscript plus m subscript 1 end subscript m subscript 2 end subscript plus n subscript 1 end subscript n subscript 2 end subscript$ = 0 …etc, then, $capital delta equals open vertical bar table row cell l subscript 1 end subscript blank m subscript 1 end subscript blank n subscript 1 end subscript end cell row cell I subscript 2 end subscript blank m subscript 2 end subscript blank n subscript 2 end subscript end cell row cell I subscript 3 end subscript blank m subscript 3 end subscript blank n subscript 3 end subscript end cell end table close vertical bar to the power of 2 end exponent$ is equal to

If $l subscript r end subscript superscript 2 end superscript plus m subscript r end subscript superscript 2 end superscript plus n subscript r end subscript superscript 2 end superscript equals 1$ where r = 1, 2, 3 and $I subscript 1 end subscript I subscript 2 end subscript plus m subscript 1 end subscript m subscript 2 end subscript plus n subscript 1 end subscript n subscript 2 end subscript$ = 0 …etc, then, $capital delta equals open vertical bar table row cell l subscript 1 end subscript blank m subscript 1 end subscript blank n subscript 1 end subscript end cell row cell I subscript 2 end subscript blank m subscript 2 end subscript blank n subscript 2 end subscript end cell row cell I subscript 3 end subscript blank m subscript 3 end subscript blank n subscript 3 end subscript end cell end table close vertical bar to the power of 2 end exponent$ is equal to

parallel

If A and B are two non-singular square matrices of the same order, the adjoint of AB is equal to

If A and B are two non-singular square matrices of the same order, the adjoint of AB is equal to

If I = $open square brackets table row cell 1 blank 0 end cell row cell 0 blank 1 end cell end table close square brackets$ , J = $open square brackets table row 0 1 row cell negative 1 end cell 0 end table close square brackets$ and B = $open square brackets table row cell c o s invisible function application theta end cell cell s i n invisible function application theta end cell row cell negative s i n invisible function application theta end cell cell c o s invisible function application theta end cell end table close square brackets$ , then B equals

If I = $open square brackets table row cell 1 blank 0 end cell row cell 0 blank 1 end cell end table close square brackets$ , J = $open square brackets table row 0 1 row cell negative 1 end cell 0 end table close square brackets$ and B = $open square brackets table row cell c o s invisible function application theta end cell cell s i n invisible function application theta end cell row cell negative s i n invisible function application theta end cell cell c o s invisible function application theta end cell end table close square brackets$ , then B equals

If A^′ is the transpose of a square matrix A, then

If A^′ is the transpose of a square matrix A, then

parallel

If $open vertical bar table row cell stretchy sum from k equals 0 to n minus 2 of 1 end cell cell n left parenthesis n minus 1 right parenthesis end cell cell n to the power of 2 end exponent end cell row cell stretchy sum from k equals 1 to n of 1 end cell cell left parenthesis n plus 1 right parenthesis left parenthesis n minus 1 right parenthesis end cell cell n left parenthesis n plus 1 right parenthesis end cell row cell stretchy sum from k equals 1 to n minus 1 of 1 end cell cell n to the power of 2 end exponent plus 1 end cell cell n to the power of 2 end exponent end cell end table close vertical bar$ = 72, then n is equal to

If $open vertical bar table row cell stretchy sum from k equals 0 to n minus 2 of 1 end cell cell n left parenthesis n minus 1 right parenthesis end cell cell n to the power of 2 end exponent end cell row cell stretchy sum from k equals 1 to n of 1 end cell cell left parenthesis n plus 1 right parenthesis left parenthesis n minus 1 right parenthesis end cell cell n left parenthesis n plus 1 right parenthesis end cell row cell stretchy sum from k equals 1 to n minus 1 of 1 end cell cell n to the power of 2 end exponent plus 1 end cell cell n to the power of 2 end exponent end cell end table close vertical bar$ = 72, then n is equal to

The determinant $capital delta equals open vertical bar table row a b cell a alpha plus b end cell row b c cell b alpha plus c end cell row cell a alpha plus b end cell cell b alpha plus c end cell 0 end table close vertical bar$ is equal to zero if

The determinant $capital delta equals open vertical bar table row a b cell a alpha plus b end cell row b c cell b alpha plus c end cell row cell a alpha plus b end cell cell b alpha plus c end cell 0 end table close vertical bar$ is equal to zero if

Equation of the line passing though the point of intersection of the lines x + 2y – 3 = 0 and x
+ y –2 = 0 and also through the point (2, 1) is

For such questions, we should know different formulas to find equation of line.

Equation of the line passing though the point of intersection of the lines x + 2y – 3 = 0 and x
+ y –2 = 0 and also through the point (2, 1) is

For such questions, we should know different formulas to find equation of line.

parallel

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