Calculating Doppler Frequency Shift for Ultrasonic Waves

[nao113]

Homework Statement

Calculate the Doppler frequency shift under the following condition:
Ultrasonic frequency = 5 [MHz] Velocity of target = 0.1 [m/s]
Angle between the US beam and flow =60 [deg.]

I put the detait of the question and my answer below
Did I answer it correctly?

Relevant Equations

f = 2. vr. fs. cos /c

Answer;

 

[haruspex]

Homework Statement:: Calculate the Doppler frequency shift under the following condition:
Ultrasonic frequency = 5 [MHz] Velocity of target = 0.1 [m/s]
Angle between the US beam and flow =60 [deg.]

I put the detait of the question and my answer below
Did I answer it correctly?
Relevant Equations:: f = 2. vr. fs. cos /c

View attachment 302557
Answer;
View attachment 302558

Looks ok, except that it violates the usual rules of significant digits. Since the given frequency and speed have only one such the answer should be given as $3\times 10^2$Hz. On the other hand, the question setter might not have intended that.