1
WB JEE 2016
MCQ (Single Correct Answer)
+1
-0.25
The energy required to break one mole of hydrogen-hydrogen bonds in H2 is 436 kJ. What is the longest wavelength of light required to break a single hydrogen-hydrogen bond?
A
68.5 nm
B
137 nm
C
274 nm
D
548 nm
2
WB JEE 2016
MCQ (Single Correct Answer)
+2
-0.5
The time taken for an electron to complete one revolution in Bohr orbit of hydrogen atom is
A
$${{4{m^2}\pi {r^2}} \over {{n^2}{h^2}}}$$
B
$${{{n^2}{h^2}} \over {4m{r^2}}}$$
C
$${{4{\pi ^2}m{r^2}} \over {nh}}$$
D
$${{nh} \over {4{\pi ^2}m{r^2}}}$$
WB JEE Subjects