Q9 / 180 · COMEDK 2019 · Chemistry
Tetrahedral structure is formed by
- A$s p^{2}$-hybridisation
- Correct answerB$s p^{3}$-hybridisation
- C$d s p^{3}$-hybridisation
- D$d^{2} s p^{3}$-hybridisation
Solution
Tetrahedral structure is formed by $s p^{3}$ hybridisation. Here, four $s p^{3}$-hybridised orbitals are arranged in tetrahedral structure.
$\Rightarrow \quad f_{0}\left(\frac{c+v}{c}\right)-f_{0}\left(\frac{c-v}{c}\right)=\frac{2}{100} f_{0}$ where, $c$ is speed of sound in air and $v$ is the velocity of source. $$ \begin{aligned} \Rightarrow & & \frac{2 v}{300} &=\frac{2}{100} \\ \Rightarrow & v &=3 \mathrm{~ms}^{-1} \end{aligned} $$
$\Rightarrow \quad f_{0}\left(\frac{c+v}{c}\right)-f_{0}\left(\frac{c-v}{c}\right)=\frac{2}{100} f_{0}$ where, $c$ is speed of sound in air and $v$ is the velocity of source. $$ \begin{aligned} \Rightarrow & & \frac{2 v}{300} &=\frac{2}{100} \\ \Rightarrow & v &=3 \mathrm{~ms}^{-1} \end{aligned} $$
Hence, the correct answer is option: 'B'.