Some energy levels of a molecule are shown in the figure with their wavelengths of transitions. Then :
Select the correct statements among the following :
A. Slow neutrons can cause fission in $${ }_{92}^{235} \mathrm{U}$$ than fast neutrons.
B. $$\alpha$$-rays are Helium nuclei.
C. $$\beta$$-rays are fast moving electrons or positrons.
D. $$\gamma$$-rays are electromagnetic radiations of wavelengths larger than $$\mathrm{X}$$-rays.
Choose the most appropriate answer from the options given below :
Given below are two statements:
Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges.
Statement II: Atoms of each element are stable and emit their characteristic spectrum.
In the light of the above statements, choose the most appropriate answer from the options given below.
Match List I with List II:
| List I (Spectral Lines of Hydrogen for transitions from) |
List II (Wavelengths (nm)) |
||
|---|---|---|---|
| A. | $$ n_2=3 \text { to } n_1=2 $$ |
I. | 410.2 |
| B. | $$ n_2=4 \text { to } n_1=2 $$ |
II. | 434.1 |
| C. | $$ n_2=5 \text { to } n_1=2 $$ |
III. | 656.3 |
| D. | $$ n_2=6 \text { to } n_1=2 $$ |
IV. | 486.1 |
Choose the correct answer from the options given below: