Science practice

How is sound produced?

• Sound is produced when someone makes a sound.

• Sound is produced by vibrations.

• Sound is produced by wavelengths.

• Sound is produced by amplitudes.

What happens when prongs move outwards?

• Air particles are compressed, Compression.

• Air particles are spread out, Rarefraction.

Humans can hear between how many hertz?

• 2 Hz - 19 Hz

• 25 Hz - 19 000 Hz

• 21 000 Hz - 200 000

• 12 Hz - 2000 Hz

Which of the following is a property of light?

• It cannot travel in a vacuum.

• It is a transverse wave.

• It travels in a straight line.

• Opaque objectd can emit light on their own.

What is the speed of light in a vacuum

• 300 000 000 m/s

• 30 000 000 m/s

• 3 000 000 m/s

• 300 000 m/s

Unwanted or loud sounds

• Screaming

• Noise

• Disturbance

• High pitched sounds

What is speed?

• Speed is the distance travelled per unit time.

• Speed is the time travelled per unit distance.

• Speed is how fast you are.

• Speed is how fast we walk.

What is the speed of an object in an instant?

• Instantaneous speed

• Super speed

• Above average speed

• Average speed

What can we use to measure speed?

• Timing gates

• Traffic lights

• Solar panels

• Radio speed checker

What does stationary mean?

• A consistant speed.

• Not moving.

• Speed that changes a lot.