iran-konkur 2017 Q202

iran-konkur · Other · konkur-riazi_1396_specialized Not Maths
202- Materials that have the property of fluorescence absorb light of wavelength .................. and emit it as light of wavelength .................. and are released. The light continues after the light source is cut off.
  1. Definite, continues for a long time after the source is cut off.
  2. Short, colorless, cut off.
  3. Long, continues for a long time after the source is cut off.
  4. Definite, long, colorless, cut off.
\textbf{202-} Materials that have the property of fluorescence absorb light of wavelength .................. and emit it as light of wavelength .................. and are released. \textbf{The light continues after the light source is cut off.}

\begin{enumerate}
\item Definite, continues for a long time after the source is cut off.
\item Short, colorless, cut off.
\item Long, continues for a long time after the source is cut off.
\item Definite, long, colorless, cut off.
\end{enumerate}