السلام عليكم

انا كان عندى اسئلة و عايزة اتأكد من الحل .
يا ريت حد يصححلى

1)
time taken to make one complete oscillation = 0.1 s
no. of complete oscillation in 100 sec is ......... ( 10 - 100 - 1000 -0.1 ) oscillation

انا حلى 1000
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2)
if amplitude is double .. speed will
a- increase
b- decrease
c- remain

حلى increase
عشان v = d/t
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3)
periodic wave transfer
( energy - mass - both - neither )
حلى energy
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و شكرا جدا على مساعدتكم