3 3 sound

The aim of the speed of sound in air core practical is to measure the speed of sound in air between two points.

The independent variable in the speed of sound in air core practical is the distance between the two points.

The dependent variable in the speed of sound in air core practical is the time between clapping and hearing the clap.

The purpose of the microphones is to detect sound waves and convert them into an electrical signal.

The equation to calculate the speed of sound between two points is:

Systematic errors can be minimized by ensuring the time-base scale is calibrated correctly on the oscilloscope.

To improve accuracy, take repeat readings and calculate an average time to minimize random errors.

The core practical that uses the equipment in the diagram is measuring the speed of sound with an oscilloscope.

The core practical that uses the set-up in the diagram is measuring the speed of sound in air.

An oscilloscope is a device that can be used to study a rapidly changing signal.

A type of rapidly changing signal that can be studied using an oscilloscope is any one from:

The name of the device shown in the diagram is an oscilloscope.

False. The sound detected by a microphone is displayed as a transverse wave on an oscilloscope.

The quantity on the x-axis of the oscilloscope is time base.

The wave feature that the time base on an oscilloscope screen is used to measure is time period.

The quantity related to the height of the wave on the oscilloscope screen is amplitude.

The wave frequency increases when more waves are displayed on the oscilloscope screen

The aim of the oscilloscope core practical is to investigate the frequency of a sound wave using an oscilloscope.

The purpose of the tuning fork in the oscilloscope core practical is to generate sound waves of different frequencies.

The dependent variable in the oscilloscope core practical is the time period.

True. The microphone must be connected to the oscilloscope for it to display the sound wave.

The resolution of the time base is usually measured in milliseconds per centimetre (ms/cm).

Random errors can be minimised by carrying out the experiment in a quiet location.

The oscilloscope display should be frozen or a picture taken to measure and record the time period of the wave signal after striking the tuning fork.

Sounds with a high frequency (or short wavelength) have a high pitch, and sounds with a low frequency (or long wavelength) have a low pitch.

Sounds with a large amplitude have a high volume, and sounds with a small amplitude have a low volume.

False. Decreasing the amplitude of a sound wave will decrease its volume.

False. Increasing the frequency of a sound wave will increase its pitch.

Decreasing the frequency of a sound wave will decrease the pitch of the sound.

Increasing the amplitude of a soundwave would increase the volume of the sound.

The frequency range for human hearing is 20 to 20 000 Hz.

The waveform with the loudest sound is the one with the largest amplitude. This is the blue waveform.