MCQ
Modern treatment method $P.E.T.$ is based on $!$
  • A
    proton emission
  • positron emission
  • C
    $\beta^{-}$ emission
  • D
    particle emission

Answer

Correct option: B.
positron emission
b
$P.E.T.$ is positron emission tomography is a nuclear medicine functional imaging technique used to observe metabolic processes to diagnosis of disease.

$F ^{18} \rightarrow$ positron $+ r$ rays, used to detect cancer heart prob. brain dis$-$order

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

If a body $A$ of mass $M$ is thrown with velocity $v$ at an angle of ${30^o}$ to the horizontal and another body $B$ of the same mass is thrown with the same speed at an angle of ${60^o}$ to the horizontal. The ratio of horizontal range of $A$ to $B$ will be
Let a total charge $2Q$ be distributed in a sphere of radius $R$, with the charge density given by $\rho(r) = kr$, where $r$ is the distance from the centre. Two charges $A$ and $B$, of $-Q$ each, are placed on diametrically opposite points, at equal distance, $a$, from the centre. If $A$ and $B$ do not experience any force, then
A remote-sensing satellite of earth revolves in a circular orbit at a height of $0.25 \times 10^6\, m$ above the surface of earth. If earth's radius is $6.38 \times 10^6\, m$ and $g = 9.8 \,ms^{-2}$, then the orbital speed of the satellite is ...... $kms^{-1}$
The resistance $R =\frac{V}{I}$ where $V= 100  \pm 5 \,volts$ and $ I = 10  \pm 0.2$ amperes. What is the total error in $R$ ......... $\%$
Assertion : The setting sun appears to be red.

Reason : Scattering of light is directly proportional to the wavelength.

A person carrying a whistle emitting continuously a note of $272 Hz$ is running towards a reflecting surface with a speed of $18\, km/hour. $ The speed of sound in air is $345m{s^{ - 1}}$. The number of beats heard by him is
Match list-$I$ with list-$II$:

List-$i$ List-$2$
$(A)$Kinetic energy of plant  $(1)$ $-\frac{\mathrm{GMm}}{\mathrm{a}}$
$(B)$ Gravaitatioin  potentiyal energy of sun -plant system  $(2)$ $\frac{\mathrm{GMm}}{2 \mathrm{a}}$ 
$(C)$Total mecaniacal energy of palnt  $(3)$ $\frac{\mathrm{Gm}}{\mathrm{r}}$
$(D)$Escap energyat the surface of plant for unit mass object $(4)$ $-\frac{\mathrm{GMm}}{2 \mathrm{a}}$

(Where $\mathrm{a}=$ radius of planet orbit, $\mathrm{r}=$ radius of planet, $M=$ mass of Sun, $m=$ mass of planet)

Choose the correct answer from the options given below:

Two copper balls, each weighing $10\,g$ are kept in air $10\, cm$ apart. If one electron from every ${10^6}$ atoms is transferred from one ball to the other, the coulomb force between them is (atomic weight of copper is $63.5$)
A black coloured solid sphere of radius $R$ and mass $M$ is inside a cavity with vacuum inside. The walls of the cavity are maintained at temperature $T_0$. The initial temperature of the sphere is $3T_0$. If the specific heat of the material of the sphere varies as $\alpha T^3$ per unit mass with the temperature $T$ of the sphere, where $\alpha $ is a constant, then the time taken for the sphere to cool down to temperature $2T_0$ will be ( $\sigma $ is Stefan Boltzmann constant)
Assertion : Acetamide has more polar $\begin{matrix}
   \backslash   \\
   /  \\
\end{matrix}C=O$ group than ethyl acetoacetate.

Reason : $\overset{\centerdot \,\,\centerdot }{\mathop{N}}\,{{H}_{2}}$ is more electron donating than $\overset{\centerdot \,\centerdot \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{O{{C}_{2}}{{H}_{5}}}}\,$