The periodic time of radiation is $4 \times 10^{-10} \ s$. Find the wavelength,wave number,and frequency.
- A$\nu = 2.5 \times 10^{9} \ Hz, \lambda = 0.12 \ m, \bar{\nu} = 8.33 \ m^{-1}$
- B$\nu = 2.5 \times 10^{8} \ Hz, \lambda = 0.12 \ m, \bar{\nu} = 8.33 \ m^{-1}$
- C$\nu = 2.5 \times 10^{9} \ Hz, \lambda = 0.12 \ m, \bar{\nu} = 8.33 \ cm^{-1}$
- D$\nu = 2.5 \times 10^{10} \ Hz, \lambda = 0.12 \ m, \bar{\nu} = 8.33 \ m^{-1}$
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