Science

18. How do you calculate wave speed? What is wave speed if the frequency is 10 Hz and the wavelength is 3m?

10/3, wave speed (in m/s) =frequency (in Hz) wavelength (in m) s= f λ

1.Define wave. What do waves transfer? What don't they transfer?

A wave is a disturbance that transfers energy from one place to another without transferring matter. The energy transferred to the water produces waves. Waves transfer energy, but they leave matter in the same place after they pass.

7.Define crest and trough.

Crest: the top of something Trough: lowest point

17. How do you calculate frequency? What is the frequency if 5 waves pass in 1 second?

F= V/ λ 5/1 To calculate the frequency of wave, divide the number of wavelengths by the time.

11. How do you determine the amplitude of a transverse wave?

In a transverse wave, amplitude is the measure from the resting position to high point of the wave or to low point of the wave In a longitudinal wave, amplitude is measured by determining how far the molecules of the medium have moved from their normal rest position.

4.In a longitudinal wave, in what direction do the particles move relative to wave direction?

In surface waves, particles of the medium undergo a circular motion

12. How does increased amplitude affect a longitudinal wave? Discuss what it does to rarefaction and compression.

Increased longitudinal wave reduction, A compression is a region in a longitudinal wave where the particles are closest together. A rarefaction is a region in a longitudinal wave where the particles are furthest apart.

25. What is reflection?

Reflection is the bouncing of a wave off a surface.

29. Why can you hear sound from a room when you are down the hall, but you can't see what is in the room when you are down the hall?。

Sound is a kind of energy that's produced when things vibrate. The energy has to go somewhere, so it travels outward, away from the sound source, making objects and the air all around us vibrate in sympathy until what's left of the energy reaches our ears. the wavelengths of sound waves are roughly the same size as the width of the doorway. Therefore, sound waves spread out as they travel through the doorway. The wavelengths of light waves are more than a million times smaller than the width of a doorway. As a result, light waves do not spread out as they travel through the doorway. Because the wavelengths of light waves are so much smaller than sound waves, you can't see into the room until you reach the doorway. However, you can hear the sounds much sooner.

32. What is destructive interference?

Sound waves with higher amplitudes sound louder than sound waves with lower amplitudes.

9. What is amplitude.

The amplitude of a wave is the maximum distance that the wave moves from its rest position.

28. What is diffraction? Give an example of diffraction?

The change in direction of a wave when it travels by the edge of an object or through an opening is called diffraction. Diffraction causes the water waves to travel around the edges of the object and to spread out after they travel through the opening

16. What is frequency? What unit is it measured in? How is frequency related to vibrations?

The frequency of a wave is the number of wavelengths that pass by a point each second. unit is HZ, Each vibration of the object produces one wavelength.

30. What do we call it when waves interact with each other?

The interaction of waves with other waves is called wave interference.

13. What is wavelength? What type of units is it measured in?

The wavelength of a wave is the distance from one point on a wave to the same point on the next wave. Wavelength is the distance from one compression to the next compression or from one rarefaction to the next rarefaction(?)

22.What are three ways that waves can interact with matter?

Three ways that waves may interact with matter are reflection, refraction, and diffraction

3.In a transverse wave, in what direction do the particles move relative to wave direction?

Transverse waves are always characterized by particle motion being perpendicular to wave motion

19. What type of matter do mechanical wave travel fastest through? What type of matter do mechanical waves travel slowest through?

Unlike mechanical waves, electromagnetic waves move fastest in empty space and slowest in solids.

33. What happens to the original waves after they travel through each other?

Wave interference may occur when two waves that are traveling in opposite directions meet.

14. How would you measure the wavelength of a transverse wave?

Wavelength can be measured as the distance between two adjacent crests of a transverse wave or two adjacent compressions of a longitudinal wave.

24. What is transmission? Give an example of a material that does not transmit light waves and one that almost fully transmits light waves. What happens to the waves that are not transmitted?

When visible light waves reach the paper, almost all their energy is absorbed,

8.Define rarefaction and compression

diminution in the density of something the action of compressing or being compressed.

20. Where do electromagnetic waves travel the fastest? The slowest?

electromagnetic waves move fastest in empty space and slowest in solids.

31. What is constructive interference?

interference is a phenomenon in which two waves superpose to form a resultant wave of greater, lower, or the same amplitude If the two amplitudes have opposite signs, they will subtract to form a combined wave with a lower amplitude.

27. What is refraction? Give an example of refraction.

is the change in direction of a wave that occurs as the wave changes speed when moving from one medium to another. The speed of light waves in water is about three-fourths the speed of light waves in air. When light is refracted into water, When light waves slow down, they change direction. For example When the pencil is put into the water.

10. What happens to amplitude if you increase energy?

the larger the amplitude, the more energy the wave carries

23.(1)What is absorption? What does the amount of absorption depend on? (2)What does the color of a material indicate about the absorption of light?

the process or action by which one thing absorbs or is absorbed by another. The size of a water wave depends on the energy it carries. An object has the color of the wavelengths it reflects.

15. How would you measure the wavelength of a longitudinal wave?

the wavelength is the distance between successive points (where the point repeats itself) on a wave.

34. What is a standing wave?

vibration of a system in which some particular points remain fixed while others between them vibrate with the maximum amplitude.

2.Compare and contrast mechanical waves and electromagnetic waves.

water wave is an example of a mechanical wave. A wave that can travel only through matter is a mechanical wave. Mechanical waves can travel through solids, liquids, and gases. A mechanical wave cannot travel through the space between the Sun and Earth. Light is an electromagnetic wave. An electromagnetic wave is a wave that can travel through empty space and through matter.

26. (1)What is the law of reflection? State the law and draw/label a diagram. (2)If the angle of reflection is 30 degrees. What is the angle of incidence?

when a wave is reflected from a surface, the angle of reflection is equal to the angle of incidence. If the angle of reflection is 30 degrees, the angle of incidence is 60 degrees.