3RD QUARTER PART 2

Sound plays a vital role in our daily living. Communication is one among of its uses. Can we also use sound in emergency response?

• No, because sound is used only for communication.

• No, because it leads others in panic if a loud sound is produced.

• Yes, because a loud sound can drive away a strong typhoon or flood.

• Yes, because a loud sound can be the fastest way to inform the community that a disaster might come.

Which of the following statements are TRUE on solid materials?

• I and II only

• II and III only

• I, II, and III only

• II, III and IV only

If the speed of a wave is 200 m/s  and its frequency is 10 Hz , what is its wavelength?

• 20 m

• 30 m

• 40 m

• 50 m

A periodic wave with wavelength 2m has speed 6 m/s . What is the wave’s frequency?

• 3 Hz

• 4 Hz

• 12 Hz

• 24 Hz

Luis was asked by his Science teacher if the movement of sound can be faster in solid than in liquid. He answered yes. Is Luis correct?

• No, because sound travels faster in liquid than in solid.

• No, because solid and liquid have the same speed of sound.

• Yes, because solid components are more elastic than liquid.

• Yes, because the molecules are more compressed in solid than in liquid.

After a rainstorm, a rainbow may appear in the sky. Which statement explains this observation?

• Raindrops act as prisms separating sunlight into colors.

• When the sunlight is reflected, it separates into different colors.

• When the sunlight is reflected, it separates into different colors.

• The white clouds are actually prisms composed of different colors.

If a color has a short wavelength, what type of frequency does it have?

• high

• moderate

• low

• none of the above

Which color has the SHORTEST wavelength?

• violet

• red

• green

• yellow

Which of the following statements about colors of light is correct?

• Color is a property of a material.

• Yellow is the primary color of light.

• White light is made up of 7 colors.

• Cyan is a combination of red and blue light.

If a material absorbs all frequency of light waves EXCEPT green, what color will be perceived by the observer?

• black

• green

• white

• yellow