Question

如图7-5-14所示，实线是一列简谐波在某一时刻的波的图象，虚线是该列波0.2s后的图象，则这列波可能的波速为多大？

Answer 1

v =

=20 n +5(m/s) ( n =0,1,2,3, ^......)

若波向左传播 t =( n +

) T= 0.2s

T =

(s) ( n =0,1,2,3, ^......)

v =

=20 n +15(m/s) ( n =0,1,2,3, ^......)

若波向右传播 t =( n +

) T= 0.2s

T =

(s) ( n =0,1,2,3, ^......)

v =

=20 n +5(m/s) ( n =0,1,2,3, ^......)