standing waves

Question 1

what are standing waves?

Answer 1

when 2 waves with the same λ and speed travel in opposite directions, through the same medium simultaneously.

Question 2

progressive wave

Answer 2

• every particle is displaced by the same distance

- progressive waves move forward (progress) with a certain wave velocity)

Question 3

standing wave displacement

Answer 3

the displaced particles vary from zero (nodes) to a maximum of 2A (antinodes)
-standing waves don’t progress (move forward)

Question 4

how are standing waves an example of resonance

Answer 4

-moving back and forth simultaneousy –>orderly pattern produced

Question 5

transverse standing waves

Answer 5

think of a stretched wire

–>all harmonics are possible

Question 6

λ/2 (half a wavelength)

Answer 6

fundamental/1st harmonic

-lowest possible frequency in which a system can vibrate in

Question 7

λ2 (one wavelength)

Answer 7

first overtone/2nd harmonic

-as its the first note above the fundamental, but the second wave

Question 8

2

Answer 8

3rd harmonic/2nd overtone

(2nd note above the fundamental

Question 9

longitudinal standing wave

Answer 9

produced when sound waves are reflected from the end of a closed pipe

Question 10

closed pipe: λ4

Answer 10

fundamental/1st harmonic

Question 11

closed pipe: 3λ2/4

Answer 11

3rd harmonic/1st overtone

no second harmonic in a closed pipe

Question 12

CLOSED PIPE 5λ3/4

Answer 12

5th harmonic, 2nd overtone

Question 13

in a closed pipe?

Answer 13

only odd harmonics are possible

Question 14

in an open pipe?

Answer 14

all harmonics are possible

Question 15

how do waves reflect at the open ends of an open pipe?

Answer 15

they reflect wherever there is a change in medium