Science 8 DB 2ndQtr

  How does the movement of particles affect the speed of sound?

• The faster the movement, the faster the speed of sound.

• The faster the movement, the slower the speed of sound.

• The faster the movement, the average the speed of sound.

• None of the above

How does the temperature of a medium affect the speed of sound?

•   The hotter the medium, the faster the speed of sound.

• The hotter the medium, the slower the speed of sound.

• The hotter the medium, the average the speed of sound.

• None of the above

Compare SONAR and Echolocation.

• SONAR is used in military and wars while Echolocation is used by bats and dolphins to find mate.

• SONAR and Echolocation emit high-pitched sound to detect objects.

• Both choices

• None of the above

It is the interaction between two or more sound waves.

• Reflection

• Interference

• Dispersion

• Refraction

It is the bending of sound in response to heat.

• Reflection

• Dispersion

• Refraction

• Interference

It is the bouncing of sound when it hits an obstacle.

• Reflection

• Dispersion

• Refraction

• Interference

Why should concerts be held at night, in relation to the bending of sound?

• Concerts should be held at night so that the audience can sing and jam along with the singer, and they can have a great time.

• Concerts should be held at night so that the audience can hear your beautiful voice better, since sound bends downwards at night.

• Concerts should be held at night because it is more efficient and fun. More people will come if concerts are held at night.

Give some real-life uses of Constructive and Destructive interference.

• Constructive interference is applied in cellphones and televisions, while destructive interference is used in speakers and headphones.

• Constructive interference is applied in amplifiers, while destructive interference is used in Active Noise Control

• All of the above

• None of the above

What should we do to prevent reverberation in movie theaters?

• By using heavy curtains, carpets, and upholstery in movie theaters.

• By getting out of movie theaters and watching through Netflix instead

• By wearing noise-cancelling headphones to prevent unnecessary noise

• None of the above

What is the meaning of the word LASER?

• Light Amplifying by Stimulating Exposure of Radiation

• Light Amplifiers by Stimulation Exposure of Radiation

• Light Amplification by Stimulated Emission of Radiation