WAVES

Question 1

what is wavelength

Answer 1

distance of an entire oscillation

Question 2

what is amplitude

Answer 2

maximum displacement of a point of a wave from its rest position

Question 3

what is time period

Answer 3

time it takes for one complete oscillation

Question 4

what is frequency

Answer 4

number of waves tht pass a fixed place in a given amount of time

Question 5

what is a transverse wave

Answer 5

oscillation are perpendicular to the direction of energy transfer

Question 6

give examples of transverse waves

Answer 6

light, radio, waves of water

Question 7

what are longitudinal waves?

Answer 7

oscillation is parallel to the direction of energy

Question 8

give examples of longitudinal waves

Answer 8

sound waves and ultrasound waves

Question 9

what do longitudinal waves

Answer 9

compressions and refractions

Question 10

how do you calculate frequency

Answer 10

1/t

Question 11

whats the practical for frequency,wavelength and speed

Answer 11

fill ripple tank with water znd place a vibrating bar inside of it
connect the vibrating bath to a power pack
place a lamp above the ripple tank and a sheet of white paper belkow it
turn on the ripple tank
to find wavelength : measure the distance of 10 wavelengths on the paper and divide it by 10 to find one
freuquency:set a timer and count the number of waves in 10seconds and ivide it by 10 the find the frequceny of one
speed:frequecy x wavelength

Question 12

how do you measure the speed of sound

Answer 12

attach microphone to oscilloscope
clap once next to microphone
sound will echo off the wall and come back to microphone
uise oscilloscope to measure the time it took the travel
total distance/time

Question 13

what happenes in the leslie cube practical

Answer 13

leslie cube with 4 different surfaces
fill leslie cube with hot water
point inferred detector at each surface
keep same distance between lelie cube and detector so measurements are repeatable
the results in order from most to least inferred immersion :matt black shiny black white and shiny matallic

Question 14

what happens when light enters a medium

Answer 14

their speed changes as does their angle as it bends towards the normal

Question 15

in refraction what happens to frquency

Answer 15

stays constant

Question 16

how are the angle of refraction and angle of incidence related

Answer 16

angle of refraction is smaller than the angle of incidence

Question 17

if we dont have a infared detector in the leslie cube practical what should we use and what are the problems with it

Answer 17

use a thermometer with bulb painted black
the problems are that the resolution is lower this is bad because it will not be able to detect large differences between surfaces