Posterous theme by Cory Watilo

Answers to PFY p.178

 

3.7 Answers

10 February 2011

14:52

PFY p.178 Answers

Image001

v = f λ

v = 170 x 2

v = 340m/s

 

Image002

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

 

Image003

f = 1 / T

2 = 1 / T

T = 0.5s

 

Image004

·         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