Sounds are produced when objects ___, which involves a rapid back-and-forth movement.

Vibrate

True or False: Sound travels best through gases due to closely packed particles.

False. Sound travels best through solids.

Fill in the blank: The effectiveness of sound transmission depends on the material's ___.

Properties

What is the relationship between vibrations and sound transmission through different materials?

Riddle: I am invisible but can be felt when you hum. I travel through different materials to reach your ears. What am I?

Sound

What role do vibrations play in the production of sound?

Vibrations cause the air or other medium to move, creating sound waves that travel to our ears.

Fill in the blank: When a jar is struck, vibrations travel through the jar to a plastic wrap, causing ___ on the wrap to move.

Rice grains

What defines the volume of a sound?

Volume refers to the loudness or quietness of a sound.

What is the relationship between the size of vibrations and sound volume?

The unit used to measure sound volume is called ___.

Decibel (dB)

True or False: Sounds measured above 85 dB can be harmful to hearing.

True

What is used to measure the volume of sound in decibels?

A sound level meter is used to measure the volume of sound in decibels.

High-pitched sounds are produced by ___ vibrations, while low-pitched sounds are produced by ___ vibrations.

Fast; slow

Riddle: I can be heard but not seen, and I can travel great distances even when I'm low. What am I?

A low-pitched sound, like that of elephants communicating.

Fill in the blank: Elephants use very low-pitched sounds that are ___ to humans but detectable by other elephants.

Inaudible

What components are involved in a sound system to amplify sound?

A microphone to capture the sound and an amplifier to increase the sound’s intensity.

True or False: Bats use low-pitched sounds for navigation and communication.

False - Bats use very high-pitched sounds for navigation and communication.

What does pitch describe in relation to sound?

Pitch describes whether a sound is high or low.

What are the main components of a sound system used for amplifying sound?

Muffling sounds is a method to ___ when the source cannot be silenced.

Reduce their volume

True or False: Ear defenders are used to enhance sound intensity in noisy environments.

False. Ear defenders are used to protect hearing by reducing sound intensity.

What materials can be used to absorb sound in a building?

Carpets and curtains can be used to absorb sound and reduce noise transmission.

Riddle: I can be found on walls and floors, helping to keep noise at bay. What am I?

Soundproofing materials.

Fill in the blank: Silencers are fitted to vehicles like cars, trucks, and motorbikes to reduce ___ noise.

Engine

What impact does excessive noise from traffic and construction have on the environment?

It contributes to noise pollution, which negatively impacts the environment.