Sonar is often used to find sunken ships underwater. Sonar is the process of using ______ waves and bouncing them off of solid objects to locate their positions.
Responses
A imagingimaging
B infraredinfrared
C lightlight
D sound
D sound
Many emerging technologies, including that used in ever-improving cell phones, begin with the capture and analysis of speech. In wireless technology, electronics inside a mobile telephone convert your voice into an electrical signal, which is then transmitted by ___________ to the nearest cell tower.
Responses
A gamma raysgamma rays
B radio wavesradio waves
C magnetic wavesmagnetic waves
D infrared waves
B radio waves
Electromagnetic waves have positive and negative attributes. One electromagnetic wave can cause cancer, but it can also be used as a sterilizing and disinfecting agent to kill bacteria and viruses in medical situations. What is this electromagnetic wave?
Responses
A microwavesmicrowaves
B X-ray wavesX-ray waves
C gamma wavesgamma waves
D ultraviolet waves
D ultraviolet waves
Skip to resources
Question
A digital signal transmits energy in the form of waves. These waves can travel at the speed of light. Only digital information can be read and scratches or other imperfections are not read. Which conclusion would be best based on this information?
Responses
A Digital transmission of information is a fast and reliable method.Digital transmission of information is a fast and reliable method.
B Digital transmission of information is the least expensive method.Digital transmission of information is the least expensive method.
C Digital transmission of information can easily be converted to analog.Digital transmission of information can easily be converted to analog.
D Digital transmission of information is not likely to be replace other methods.
A Digital transmission of information is a fast and reliable method.
Sound is all around us. Everything we hear in our day-to-day lives has a distinctive sound, from the jingling of keys to the tapping of a pencil on a desk. Sound is created when objects vibrate. These vibrations cause the air around them to vibrate, sending sound waves in various directions. Some objects tend to vibrate at a specific rate. This is known as their resonant frequency. Your class has been assigned to build musical instruments to investigate the relationship between pitch and resonance. You and your lab partner build a guitar using different-sized rubber bands and a shoe box.
Which statements accurately describe the conclusions you make? Choose all three that apply.
Responses
A Thicker rubber bands produce a lower pitched sound.Thicker rubber bands produce a lower pitched sound.
B Loosely stretched rubber bands produce a higher-pitched sound.Loosely stretched rubber bands produce a higher-pitched sound.
C Tightly stretched rubber bands produce a lower-pitched sound.Tightly stretched rubber bands produce a lower-pitched sound.
D Thinner rubber bands will produce a higher pitched sound.Thinner rubber bands will produce a higher pitched sound.
E Tightly stretched rubber bands produce a higher-pitched sound.
A Thicker rubber bands produce a lower pitched sound.
B Loosely stretched rubber bands produce a higher-pitched sound.
D Thinner rubber bands will produce a higher pitched sound.
Each section of the electromagnetic spectrum has a different amount of energy. Gamma rays have the highest energy and radio waves have the lowest energy. Compare the energy of visible light to the energy of a microwave.
Responses
A they have the same amount of energythey have the same amount of energy
B visible light has lower energy than microwavesvisible light has lower energy than microwaves
C visible light has higher energy than microwavesvisible light has higher energy than microwaves
D it is impossible to tell the energy of light or microwavesit is impossible to tell the energy of light or microwaves