Question

Sound with a frequency of 950 Hz and a wavelength of 1 m will travel _____ kilometers in 5 minutes.

A.104
B.285
C.443
D.679
E.900

Answer 1

B. 285 km/5 min

Step-by-step explanation:

The rule that links velocity, wavelength and frequency is:

V = λν

where:

V is the velocity that we want to find

λ is the wavelength of sound = 1 m

ν is the frequency of the wave = 950 Hz

Substitute to get the velocity as follows:

V = 1 * 950 = 950 meters/sec

Now, we need to convert the meter/sec into Km/5 minutes

We know that:

To convert from meter to Km, we will divide by 1000

To convert from sec to minute, we will divide by 60 which means that, to convert from sec to 5 minutes, we will divide by 5*60 = 300

Based on this:

`950 (meter)/(sec)=950*((1)/(1000))/((1)/(300)) = 950*(3)/(10)=285 km/5 min`

Hope this helps :)