You notice the flagpole at school vibrating in the breeze. You count the vibrations and find that

the flagpole makes 20 complete vibrations in 10 seconds. You read somewhere that this

flagpole vibrates at a speed of 25 m/s when the wind is blowing. Find the wavelength of these

vibrations

Wavelength = 50 m

Explanation:

Given:

n=20

t=10sec

V=25m/s

Wavelength = ?

Solution:

Wavelength = frequency * velocity - --> eq 1

Time period=time/no of vibrations

T=10/20=0.5sec

Frequency = 1/Time period (T)

f=1/0.5=2

Put the value of frequency in eq 1

Wavelength = 2*25

Wavelength = 50m ...

Hope you understand!

Have a nice day!