**Pulses and Standing
Waves
Obj:** Predict the
velocity of a transverse wave based on the physical properties of
long spring.

**Materials:**
balance, Newton scale, spring, timer

**Data, Methods,
& Analysis**

1.** **Mass of spring ___________kg

2. Length of spring ___________m

3. Tension (T) applied to spring __________ N**
**4.

v

5.

length L of spring _____________m number of lengths traveled = 5

total length traveled by pulse (L x 5) ___________m

Time 1______s Time 2______s Time 3______s Time4______s

Average time _________s

6. % error using

7. Measure the velocity of waves from

Length of spring ___________m

Picture |
#Waves |
8 (meter) |
Time(10) |
Period T |
freq f |
Velocity m/s (f x 8 ) |

.5 |
||||||

1 |
||||||

1.5 |
||||||

2.0 |
||||||

2.5 |

8. Calculate the average velocity from the table and compare
with the calculated velocity in No. 4 above.

9. Plot the 8
(y-axis) vs Period (T). Calculate the slope. What does the slope
represent?

10. What changes occur with wavelenght and frequency in the data table?
velocity?

11. If the tension T were increased by a factor of 2, by what
factor would the velocity of the pulse be change?

12. If the velocity was to be increased by a factor of 2, by what
factor would the tension have to be increased?

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