question_answer

                  A wave enters to water from air. In air frequency, wavelength, intensity and velocity are \[{{n}_{1}},\,{{\lambda }_{1}},\,{{I}_{1}}\] and \[{{v}_{1}}\] respectively. In water the corresponding quantities are \[{{n}_{2}},\,{{\lambda }_{2}},\,{{I}_{2}}\] and \[{{v}_{2}}\] respectively; then:

A)                                                                                                                                                                                                            \[{{I}_{1}}={{I}_{2}}\]    

B)                 \[{{n}_{1}}={{n}_{2}}\]

C)                 \[{{v}_{1}}={{v}_{2}}\]  

D)                 \[{{\lambda }_{1}}={{\lambda }_{2}}\]