waves requierd practical

What is the aim of the ripple tank practical?

To measure wave speed using wavelength and frequency.

What is the key equation used?

v = fλ

• v = m/s

• f = Hz

• λ = m

How do you measure wavelength in a ripple tank?

• Measure distance across multiple waves

• Divide by number of waves

How do you measure frequency?

• Count waves passing a point in a set time

• frequency = waves ÷ time

How do you improve accuracy?

• Measure over multiple waves

• Repeat and take mean

• Use a ruler carefully

Describe the ripple tank method

• Set up ripple tank with vibrating dipper

• Produce waves at known frequency

• Measure wavelength using ruler

• Calculate speed using v = fλ

• Repeat and calculate mean

What is the aim? wave speed along a string

To calculate wave speed along a string.

What equation is used?

speed = distance ÷ time

Method wave speed along a string

• Measure distance along string

• Time how long wave takes

• Calculate speed

How to improve accuracy?

• Repeat measurements

• Use a long distance

• Use a clear start/stop point

What is a Leslie cube?

A metal cube with different surface finishes (matt black, shiny, white) used to compare infrared emission.

What is the aim of the Leslie cube practical?

To investigate how different surfaces emit infrared radiation

Method (FULL MARKS)

• Fill cube with hot water

• Allow temperature to stabilise

• Use an infrared detector

• Measure radiation from each surface at the same distance

Key variables to control

• Distance from detector

• Temperature of water

• Same environmental conditions

Results

• Matt black → best emitter

• Shiny → worst emitter

What is the aim?

To investigate how different surfaces emit or absorb infrared radiation.

Method

• Use containers with different surfaces

• Fill with hot water

• Measure temperature decrease or IR emission