Philippines Science High School
CENTRAL VISAYAS CAMPUS
Talaytay, Argao Cebu
1st Long Exam in Physics 1
Name:________________________________Section:__________Date:______
Instructions: Please print this 1st home exam before you answer. Thank you.
1st Home Exam in Physics I
I. Multiple Choices: Choose the letter of the best answer. (2 points)
1. In a standing wave pattern, the nodes are
a. one wavelength apart.
b. points of greatest amplitude.
c. points of greatest frequency.
d. half of the wavelength apart.
2. For standing waves on a string that is held fixed at one end,
a. a node is located at each end.
b. a whole number times the half the wavelength equals the length of the string
c. the whole “pattern” of the standing waves occur only for certain frequencies
d. all of the above
II. Problem Solving: Show the complete solution. (6 points)
1. A spring was tied to two fixed posts 1.5 meters apart. Solve for the longest wavelength of the standing wave that can be created between the two posts.
2. If one end of the 1-m spring is held fixed, at what rate should it’s free end be shaken to produce a standing wave pattern of 2 loops if the wave travels at 10 m/s?
3. You form a jug-and-bottle band where the musicians blow across the tops of the bottles (and the jug) to initiate sounds. Your band wants to play songs with notes ranging in frequency from 120 Hz to 300 Hz.
(a) Determine the size of the jug or bottle to play the 120-Hz sound. Explain how you made your choice.
(b) Determine the size of the jug or bottle to play the 300-Hz sound.
III. Essay: (2 points)
1. If the length of the spring is doubled without changing the wavelength, what effect will this have on the standing wave pattern produced?
2. Would refraction of sound be possible if the speed of sound were unaffected by wind, temperature, and other conditions? Defend your answer.
3. Why does sound travel faster in warm air?
4. If the frequency of sound is doubled, what change will occur in its speed? In its wavelength?
5. Why is an echo weaker than the original sound?
