14 - stationary waves

Question 1

stationary waves

Answer 1

a stable wave pattern produced from the superposition of two progressive waves of the same frequency and travelling in opposite directions

has nodes and antinodes

Question 2

node

Answer 2

a point on a stationary wave with zero amplitude

Question 3

antinode

Answer 3

a point on a stationary wave with maximum amplitude

Question 4

in a stationary wave, speed is

Answer 4

zero

Question 5

melde’s experiment

Answer 5

. string attached to pulley with weights
. vibration generator connected to signal generator

Question 6

ways of observing stationary waves

Answer 6

. melde’s experiment

. microwaves (microwave transmitter at screen/metal plate, microwaves reflected back, move probe receiver to find positions of varying intensities)

. air column closed at one end (glass tube in water, adjust height for length of water column, vibrate tuning fork at open end, resonance should occur) AIR COLUMN LENGTH = 3/4 OF A WAVELENGTH

. open ended air column ()

Question 7

resonance

Answer 7

a term used when a system oscillates with maximum amplitude by absorbing energy from a vibrating source

Question 8

Kundt’s dust tube

Answer 8

. soudspeaker sends sound waves inside a tube
. dust at antiodes vibrates violently
. dust accumulates at nodes