audio doesn't work in android

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dsdsdsdsd

my audio works in my desktop browsers, but not in the android (haven't tested in other mobiles)

		    

<audio>                                                   

  <source id   = 'for_mp3'        

          src  = ''                    <!-- src is set on demand -->                              

          type = 'audio/mpeg'                         
                                                

  <source id   = 'for_wav'         

          src  = ''                                    

          type = 'audio/wav'                          
                                                

  <span>    

    no audio ha                                                      

  </span>                                                       

</audio>

QUESTION 1 - should this work?
QUESTION 2 - does the android play the mp3 or the wav?

thanks,
dsdsdsdsd