waves- progressive and stationary

Question 1

amplitude

Answer 1

the minimum displacement from it undistirbed position

Question 2

antinode

Answer 2

a point of maximum amplitude that are 1/2 a wavelength apart from each other

Question 3

first harmonic

Answer 3

the lowest frequency at which a stationary wave is formed ( for a wave on a string or a sound wave in a tube open at both ends the length of the string/ tube is approx. 1/2 wavelength)

Question 4

second harmonic

Answer 4

a harmonic of twice the frequency of the first harmonic
( for a wave on a string, or a sound wave in a tube open at both ends, the length of the string/ tube is approx. one wavelength)

Question 5

frequency

Answer 5

the number of oscillations per unit time.

Question 6

interference

Answer 6

the superposition of two or more waves

Question 7

superposition

Answer 7

the displacement caused at a point b two waves being at that point simultaneously is the algebraic sum of the displacement that would be caused by each of the waves

Question 8

longitudinal

Answer 8

wave in which the displacement of the medium/ particles is parallel to the direction of energy transfer

Question 9

transverse

Answer 9

wave in which the displacement of the particles if parallel to the direction of energy transfer

Question 10

monochromatic wave source

Answer 10

a source producing waves of one frequency/ wavelength

Question 11

node

Answer 11

(on a stationary wave) a point of zero amplitude
consecutive nodes are half a wavelength apart

Question 12

period

Answer 12

the time for one cycle/ time for one wave to pass a point

Question 13

phase difference

Answer 13

the amount by which one wave lags or leads another in degrees or radians

Question 14

what is the phase difference of two waves on antiphase

Answer 14

half a wavelength

Question 15

what is the phase difference of two waves in phase

Answer 15

0 or 360 degrees

Question 16

plane polarised wave

Answer 16

wave in which all the oscillations are in parallel planes

Question 17

polarising filter

Answer 17

a filter that only allows waves with oscillations in one orientation to pass through , called the plane of transmission

Question 18

how do polarising filters work in sunglasses

Answer 18

light reflecting off a horizontal surface tends to become more horizontally polarised, so goggles with vertically polarised filter will be particularly effective at reducing glare from horizontal surfaces

Question 19

unpolarised wave

Answer 19

a wave containing oscillations in all planes

Question 20

progressive wave

Answer 20

a moving wave that carries energy from one place to another without transferring material

Question 21

resonant frequency

Answer 21

a frequency at which a stationary wave is formed

Question 22

stationary wave

Answer 22

formed by the superposition of two progressive waves, with the same wavelength , speed and a amplitude moving in opposite directions