Sl.No
Mode
Direction of propagation
Direction of polarization
Velocity measured 
(m/s)
Rao’s constant
10 - 6 m3/
mol/(m/s)1/3
-
relationship
1
L
[100]
[100]
1002 ± 0.07
2
L
[001]
[001]
977 ± 0.07
3
T
[001]
[010]
896 ± 0.03
4
T
[001]
[100]
919 ± 0.03
5
T
[100]
[010]
934 ± 0.04
