waves test study

Question 1

what does a progressive wave do

Answer 1

A progressive wave carries energy from one place to another

Question 2

how many types of progressive waves are there

Answer 2

There are two types of progressive waves
longitudinal and transverse
Longitudinal waves have vibrations parallel to the direction in which the wave travels, whereas transverse waves have vibrations at right angles to the direction in which the wave travels

Question 3

what is displacement

Answer 3

Displacement is the distance of a point on the wave from its undisturbed position or equilibrium position

Question 4

what is amplitude

Answer 4

Amplitude is maximum displacement of a wave

Question 5

what is wavelength

Answer 5

Wavelength is the distance between two adjacent points on a wave oscillating in step with each other.

Question 6

what is period

Answer 6

Period is time taken for one complete oscillation of a point in a wave

Question 7

what is frequency

Answer 7

Frequency is the number of oscillations per unit time of a point in a wave

Question 8

what is phase difference

Answer 8

Phase difference is the fraction of a cycle between oscillating particles, expressed either in degrees or in radians

Question 9

what phase difference do two points on a wave separated by a distance of one wavelength have

Answer 9

They have a phase difference of 0 or 360 degrees

Question 10

what does the frequency f of a wave relate do

Answer 10

The frequency f of a wave is related to its period T by the equation

f = 1/T

Question 11

What can the frequency of a sound wave be measured by

Answer 11

the frequency of a sound wave can be measured using a cathode ray oscilloscope (CRO).

Question 12

The speed of all waves is given by what equation

Answer 12

wave speed = frequency x wavelength

v = fλ

Question 13

what is the intensity of a wave

Answer 13

The intensity of a wave is defined as the wave power transmitted per unit area at right angles to the wave velocity

intensity = power/area

Question 14

Intensity units

Answer 14

intensity has units of Wm-²

Question 15

What is the Doppler effect

Answer 15

the Doppler effect is the change in an observed wave frequency when a source moves with speed Vs

Question 16

What is what is the intensity of a wave directly proportional to

Answer 16

it is directly proportional to the square of the amplitude

Question 17

What speed do all electromagnetic waves travel at

Answer 17

all electromagnetic waves travel at the same speed of 3.0 x 10^8 m s ^-1
In a vacuum, but they have different wavelengths and frequencies
electromagnetic waves are transverse waves

Question 18

The regions of the electromagnetic spectrum in order of increasing wavelength are:

Answer 18

y-rays
X-rays
ultraviolet
visible
infrared
microwaves
Radio waves

Question 19

How many places does a plane polarised wave have oscillations in

Answer 19

a plane polarised wave has oscillations in just one plane

Question 20

What type of waves can be play polarised

Answer 20

only transverse waves can be plane polarised

Question 21

Equation for Malus’s law

Answer 21

I = Io cos^2 0

Where I is the intensity of the transmitted light through the polarising filter, lo is the incident intensity of light and 0 is the angle between the transmission axis of the filter and the plane of polarisation of the incident light