Sound must travel through something that vibrates.
There is no energy in space.
There is no air to vibrate the human eardrum.
Space is too full of light energy.
Answer:
Sound must travel through something that vibrates.
There is no air to vibrate the human eardrum.
Explanation:
Waves can be divided into two types:
- Electromagnetic waves: these are waves produced by the oscillations of electric and magnetic field. This type of wave does not need a medium to propagate, so they can also travel through a vacuum
- Mechanical waves: these are waves produced by the vibrations of the particles in a medium - therefore, they do need a medium to propagate. Sound waves are part of this type, so they cannot travel through a vacuum.
According to these definitions, we can say that the correct choices are the following:
Sound must travel through something that vibrates. --> because they are mechanical waves
There is no air to vibrate the human eardrum. --> because they are mechanical waves
ultraviolet waves
light waves
sound waves
Ultrasounds are used in the medical profession for the purpose of diagnosis. Ultrasounds uses high frequency sound waves. Thus, the correct option is D.
Ultrasound are the sound waves with frequencies which are higher than the upper audible limit of normal human hearing. Ultrasound is not different from normal audible sound frequencies in its physical properties, except that humans cannot hear these sound.
Ultrasound is used in diagnostics where it is also called as sonography or diagnostic medical sonography. It is an imaging method which uses sound waves to produce images of structures within the body of a person. The images produced can provide valuable information for the purpose of diagnosing and directing treatment for a variety of diseases and conditions.
Therefore, the correct option is D.
Learn more about Ultrasound here:
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Answer:
D. sound waves
Explanation:
on edg