Waves 1
Why does cupping your hand around your ear help you to hear better? (hint: think about behaviors of waves)
It reflects more sound into your ear.
T/F: Digital signals are a series of pulses that are represented by zeros and ones?
True
What is the velocity of a wave with a wavelength of 7m and a frequency of 3Hz?
21m/s
What is the frequency of a wave if it is 5m in length and moving at a rate of 10m/s
2Hz
1) What type of wave looks like a a slinky?
2) what type of wave looks like a jump rope?
1) Longitudinal
2) Transverse
Music studios put padding on the walls to soundproof the room. Why is this important?
The walls absorb sound and prevent it from traveling through the walls.
What happens to matter and energy as a wave moves through air?
The wave will move the energy though air but not the matter.
Which color of visible light has a higher frequency, red or blue?
What is the height of a wave known as?
Amplitude
When a waves moves from one medium to another medium it changes speed, what is this called?
Refraction
Geologist use sound waves to send vibrations through the Earth to figure out what it is made up of. How are they able to tell different material apart using sound waves?
Sound waves can travel through and reflect off of rock layers.
What happens to energy and wavelength as the frequency of a wave increases?
Energy increase, wavelength decreases
Why can we see nuclear explosions on the Sun but not hear them?
Light waves can go through the vacuum of space, sound waves need a medium to pass through.
What happens when the wavelength gets longer?
Frequency becomes lower; energy becomes lower
When a digital or analog signal are distorted by noise, which one is easier to "clean"?
Digital, it is a binary signal, meaning either on or off. (1 or 0)
What is the speed of a wave with a wavelength of 5m and a frequency of 4Hz.
20m/s
1) Which instrument would produce the longer wavelength, flute or bass drum?
2) The wavelength of a sound affects it's ________?
1) bass drum
2) pitch
What is diffraction?
The wave spreads or bends as it moves moves around the edge of an obstacle.
How can you tell if a wave has a high amount of energy?
High frequency or high amplitude
What is the distance from the rest position to the crest/trough of a wave called?
Amplitude
What happens to the amplitude of a wave when the energy of that wave increases?
If the energy increases, the amplitude would increase.
T/F: Changing the amplitude of a wave also changes the waves frequency?
False
How were sound waves (SONAR) used during war time by submarines?
The sound waves were able to reflect off of objects in the water and able to show how far away the objects are.
What is the number of wavelengths that pass a given point per second.
Frequency
Explain why you will never hear an explosion in space
Because space is a vacuum and there are no particles for the sound to travel through