Class Management I Help PHY-111 Topic 7 Homework Begin Date: 4/10/2017 12:01:00
ID: 1563247 • Letter: C
Question
Class Management I Help PHY-111 Topic 7 Homework Begin Date: 4/10/2017 12:01:00 AM Due Date: 4/23/2017 11:59 00 PM End Date: 4/26/2017 11:59:00 PM (10%) Problem 23 Using special techniques called string harmonics (or "flageolet tones") stringed instruments can produce the first few overtones of the harmonic series. While a violinist is playing some of these harmonics for us, we take a picture of the vibrating string (see figures). Using an oscilliscope, we find the violinist plays a note with frequency f 795 Hz in figure (a). the expertta.com 14% Part (a) How many nodes does the standing wave in figure (a have? 14% Part (b) How many antinodes does the standing wave in figure (a) have? 14% Part (c) The string length of a v olin is about L 33 cm. What is the wavelength of the standing wave in figure (a) in meters? 14% Part (d) The fundamental frequency is the lowest frequency that a string can vibrate at (see figure (b)). What is the fundamental frequency for our violin in Hz? A 14% Part (e) In terms of the fundamental frequency fi, what is the frequency of the note the violinist is playing in figure (c)? Grade Summary fe 1 32.52 Deductions Potential 100% Submissions 4 5 6 Attempts remaining: 5 35 per attempt) detailed view vo BACKSPACE CLEAR. Submit Hint 1give up! Hints 0% deduction per hint. Hints remaining Feedback: 19% deduction per feedback. A 14% Part write a general expression for the frequency of any note the violinist can play in this manner, in terms of the fundamental frequency fl and the number of antinodes on the standing wave A 14% Part (g) What is the frequency, in hertz, of the note the violinist is playing in figure (d)?Explanation / Answer
e)
n = number of antinodes = 2
fc = 2 f1
d)
fn = n f1
f)
n = 8
fd = 8 f1
plug in the value of fundamental frequency from part d)