IL bestions In each eae when you start a simulation for the following questions reset the values using the
on the control panel at the left side of the screen Fach question assumes that you have done
his Then set only the values indicated in the question
2. Drag the 400 Hz signal into one of the speaker input boxes. Now drag the 401 Hz Signal into
the oder speaker input ber Start the simulation Desenbe what you hear. To measure the beat
frequency chek on the Rext" button the instant you start counting beats count 20 beats and
immediately stop the timer. How many seconds did it take to produce the 20 beats Count 40
beats on the same manner. How many seconds did this take? It is always good practice to make
several measurements in lab experiments like this What is the best frequency?
2. Drag the 401 Hz Signal into one of the speaker input boxes Now drag the 40 Hz signal into
the other speaker input box. Start the simulation Can you tell the difference between what you
heard in Question 1 and this experiment Measure the best frequency between these two
frequencies using the time. Count 20 beats and immediately stop the timer. How many seconds
d it take to produce the 20 beats? Count 40 beats in the same manner. How many seconds did
this take? What is the best frequency? If you know the frequency of one signal, can you tell
whether a second signal is higher or lower in frequency?
3. Drag the 401 Hz signal into one of the speaker input boxes. Now drag the 405 Hz signal into
the other speaker input box. Start the simulation. Measure the best frequency between these two
frequencies using the timer. With faster beats it is often helpful to count by fours or fives, eg. 1-
2-3-4, 2-2-3-4, 3-2-34: ete Count 40 beats and immediately stop the timer. How seconds
did it take to produce the 40 beats? Count 80 beats in the same manner. How many seconds did
this take? What is the beat frequency ? Is this frequency the same as the difference of the input
frequencies?
4. Suppose you had these two known frequencies, 405 Hz and 403 Hz available for experiment.
You played an unknown frequeney against the 403 Hz signal and found a beat frequency of 2
How would you determine the unknown frequency with certainty
5. Utilize the techniques you have learned above to compare unknown frequency W to the
known 400 and 401 Hz signals. Show calculations. What is the frequency of W
6. What is the frequency of X7 Show calculations.
7. What is the frequency of Y? Hint Count carefully. Show calculations