Answers to PFY p.178
3.7 Answers
10 February 2011
14:52
PFY p.178 Answers
v = f λ
v = 170 x 2
v = 340m/s
v = f λ
v = 200,000 x 1,500
v = 300,000,000m/s
v = f λ
300,000,000 = 500,000 x λ
λ = 600m
f = 1 / T
2 = 1 / T
T = 0.5s
· 5 complete cycles of the wave measures 10cm
· So each cycles measures 10cm/5 = 2cm
· Therefore λ = 2cm or 0.02m
v = f λ
6cm/s = f x 2cm
f = 3Hz



