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w= 2phi/ T
20phi = 2phi/T
T= 1/10
panjang gelombang:
k= 2phi /lamda
10phi= 2phi / lamda
lamda= 5
cepat rambat
v= lamda × f
v= 5 × 1/T
v= 5 × 10
v= 50
semoga membantu.. maaf klo salah