Sound waves y9

If 2 sound waves meet each other, what is created?

• A sound reflection

• An interference

• An echo

• Nothing will happen

Answer explanation

An interference is created by 2 waves meeting each other and they create a bigger wave

How many type of interference are there?

• 1

• 2

• 3

• 4

Answer explanation

Interference of light waves leads to beautiful phenomena like iridescence, diffraction patterns, and the stunning colors observed in soap bubbles and oil slicks.

What are the two types of interference?

• Constructive and Destructive

• Constructive and Reflective

• Destructive and Reverberative

• Reflective and Reverberative

Answer explanation

One of the best examples of interference is demonstrated by the light reflected from a film of oil floating on water. Another example is the thin film of a soap bubble, which reflects a spectrum of beautiful colors when illuminated by natural or artificial light sources.

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What is an example of destructive interference technology?

• Sponge

• A noise-cancelling headphone

• Helicopter

• I don't know

Answer explanation

A sponge or helicopter are not an example of destructive interference technology because sponge is not a "technology", and helicopter does not destroy sound in any way.

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What happens to 2 waves in a constructive interference?

• It disappears.

• It creates a bigger wave.

• Nothing happens

• I don't know

Answer explanation

With constructive interference, two waves with the same frequency and amplitude line up – the peaks line up with peaks and troughs with troughs as in diagram A above. The result is a wave that has twice the amplitude of the original waves so the sound wave will be twice as loud.

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What happens to 2 waves in a destructive interference?

• It disappears.

• It creates a bigger wave.

• Nothing happens

• I don't know

Answer explanation

Destructive interference is when similar waves line up peak to trough as in diagram B. The result is a cancellation of the waves.

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What do you call the highest point of a sound wave?

• Crest

• Interference

• Trough

• Echo

Answer explanation

• Wave Crest – Just like on a wave in the ocean, the wave crest is the very top of the wave. 

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What do you call the lowest point of a sound wave?

• Crest

• Interference

• Trough

• Echo

Answer explanation

• Wave Trough – On the opposite side, we find the trough. This is the very bottom of a sound wave. 

What is a number of wave in 1 second?

• Frequency

• Loudness

• Amplitude

• Wavelength

Answer explanation

The frequency of a wave is the number of complete waves that pass a given point in a certain amount of time. Frequency can also be described as the number of vibrations per second.

What is sound waves produced by?

• Heat energy

• Low temperatures

• Vibrations

• Friction

Answer explanation

Sound waves are created by object vibrations and produce pressure waves, for example, a ringing cellphone. The pressure wave disturbs the particles in the surrounding medium, and those particles disturb others next to them, and so on.