MCQOPTIONS
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MCQOPTIONS
| 1. |
An important spectral emission line has a wavelength of 21 cm. The corresponding photon energy is [MP PMT 1993] |
| A. | \[5.9\times {{10}^{-4}}eV\] |
| B. | \[5.9\times {{10}^{-6}}eV\] |
| C. | \[5.9\times {{10}^{-8}}eV\] |
| D. | \[11.8\times {{10}^{-6}}eV\] \[(h=6.62\times {{10}^{-34}}Js;\ \ c=3\times {{10}^{8}}m/s)\] |
| Answer» C. \[5.9\times {{10}^{-8}}eV\] | |