1
WB JEE 2017
MCQ (Single Correct Answer)
+1
-0.25
Which one of the following corresponds to a photon of highest energy?
A
$$\lambda$$ = 300 mm
B
v = 3 $$\times$$ 108 s$$-$$1
C
$$\overline v $$ = 30 cm$$-$$1
D
$$\varepsilon $$ = 6.626 $$\times$$ 10$$-$$27 J
2
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
3
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