| List- I (Layer of atmosphere) | List- II (Approximate height over earth's surface) | ||
| A. | F1-Layer | I. | 10 km |
| B. | D-Layer | II. | 170-190 km |
| C. | Troposphere | III. | 100 km |
| D. | E-layer | IV. | 65-75 km |
Two positively charged particles \(m_1\) and \(m_2\) have been accelerated across the same potential difference of 200 keV. Given mass of \(m_1 = 1 \,\text{amu}\) and \(m_2 = 4 \,\text{amu}\). The de Broglie wavelength of \(m_1\) will be \(x\) times that of \(m_2\). The value of \(x\) is _______ (nearest integer). 