Standing Waves 1

Question 1

what happens to wave when they hit something

Answer 1

they react different depending on the surface they encounter

Question 2

what happens when a transverse wave reach a rigid or fixed surface

Answer 2

the reflected wave is inverted due to newtons 3rd law, as the wave applies a force on the wall and the wall applies the same force back on that wave

Question 3

what is a standing wave

Answer 3

a single large, amplitude wave that doesnt appear to be moving

Question 4

how does a standing wave form

Answer 4

if other waves pulses moving through the string, the reflected pulse will interfere with them.

at the right frequencies, the pulses will interact to create a standing wave.

Question 5

what are nodes

Answer 5

no movement

points where two waves cancel each other out and destructive interference occurs and the wave is still

Question 6

what are antinodes

Answer 6

two points where the wave oscillates with maximum amplitude and constructive interference occurs.

Question 7

what is fundamental frequency (f0)

Answer 7

the simplest standing wave with just one antinode

Question 8

what are harmonics and harmonic series

Answer 8

harmonics are waves with frequencies that are integer multiples of the fundamental frequency

these frequencies form harmonic series.

Question 9

how is wavelenht and frequency calculates in each harmonic

Answer 9

L is the lenght of teh string

wavelength = 2L/n(number of antinodes)

frequency = n x f0
frequency = n x v/2L

v = f x lambda
v = f x 2L/n
f = vn/2L - proof

Question 10

harmonics in a string

Answer 10

musical instruments have strings fixed at two ends

when its played, large variety of waves with various frequencies are created

majority of these vibrations interfere randomly and die out

vibrations that correspond to the resonant frequency of string will form standing wave and remain.