The Nature Of Waves

Question 1

A wave transfers energy away from its [………] .

Answer 1

A wave transfers energy away from its SOURCE

Question 2

What can we also call a moving wave?

Answer 2

A progressive wave

Question 3

How does a Progressive wave transfer energy?

Answer 3

Carries energy from one place to another without transferring any material

Question 4

Which direction is the transfer of energy from a wave?

Answer 4

The same direction the wave is travelling

Question 5

Examples of waves that carry energy.

Answer 5

• Electromagnetic waves cause things to heat up - X Rays and Gamma rays knock electrons out of their orbits, causing ionisation

Question 6

Diagram of a Wave (Transverse).

Answer 6

Question 7

What is the Displacement of a wave?

Answer 7

How far a point has moved from its undisturbed position

Question 8

What is the Amplitude of a wave?

Answer 8

The Maximum magnitude of the displacement

Question 9

What is the Wavelength of a Wave?

Answer 9

The length of one whoe wave cycle, eg. crest to crest OR trough to trough

Question 10

What are Wavelength, Amplitude & Displacement measured in?

Answer 10

Metres

Question 11

What is the Period of a Wave?

Answer 11

The time talen for a whole cycle (vibration) to complete

Question 12

What is the frequency of a wave?

Answer 12

The number of cycles (vibrations) per second passing a given point

Question 13

What is the a Phase of a Wave?

Answer 13

A measurement of the position of a certain point along the wave cycle

Question 14

What is the Phase Different of Waves?

Answer 14

The amount one wave lags behind another

Question 15

What is the units for Frequency?

Answer 15

Hz

Question 16

What is the equation for frequency including Period?

Answer 16

Frequency = 1/Period

Question 17

What is the Wavespeed equation? (with distance and time)

Answer 17

Wave Speed = Distance / Time

v = d/t

Question 18

What is the wave speed equation? (including Frequency and wavelength)

Answer 18

Wave Speed = Frequency X wavelength

v = fλ

Question 19

What does a Cathode Ray Oscilloscope measure?

Answer 19

Voltage

Question 20

On a Cathode Ray Oscilloscope what are the splits in the screen called?

Answer 20

Divisions

Question 21

On a Cathode Ray Oscilloscope the vertical axis is in [……]

Answer 21

Volts

Question 22

What button controls the volts per division on the vertical axis?

Answer 22

The gain dial

Question 23

On a Cathode Ray Oscilloscope the horizontal axis is in [….]

Answer 23

Seconds

Question 24

On a Cathode Ray Oscilloscope what is the seconds per division controlled by?

Answer 24

The timebase dial

Question 25

Why do you alter the gain and timebase dial?

Answer 25

To make it easy to read off measurements

Question 26

A [........] converts sound waves into electrical signals which can be seen on an oscilloscope.

Answer 26

Microphone

Question 27

What can an oscillopscope be used for?

Answer 27

Used to find the speed of sound

Question 28

Diagram of the Apparatus needed to measure the speed of sound.

Answer 28

Question 29

When measuring the speed of sound what kind of Oscilloscope must be used and why?

Answer 29

A 2-beam oscilloscope so it can display two waves - one for the signal generator generating the sound wave and one for the same sound wave being received by the microphone.

Question 30

Method of Measuring the Speed of Sound?

Answer 30

1 - Set up apparatus 2 - Twist gain and timebase dials so you can see one complete cycle of each wave 3 - Change the distance between the microphone and loudspeaker sp the the peaks of wave A line up with the troughs of wave B and measure the distance. 4 - Calculate the frequency of the wave by finding the period and using f = 1/T because oscilloscope has a better resolution and gives a smaller uncertainty 5 - Move the microphone so that the wave on the oscilloscope moves one full wavelength along the signal generator, measure the distance 6 - Distance betweem your two measurements is the actual wavelength 7 - Repeat steps 5 -6 and use your results to find a mean 8 - Use equation v = f/λ to find the speed of sound

Question 31

In [.......] wave vibration is at Right Angles to the direction of travel

Answer 31

Transverse wave

Question 32

What kind of waves are Electromagnetic waves?

Answer 32

Transverse