131Sound waves with frequencies above the range of human hearing are called what?
132An echo is produced due to what phenomenon affecting sound waves?
133SONAR technology used by ships and submarines relies on which type of wave to detect underwater objects?
134Sound generally travels fastest through which state of matter?
135The apparent change in frequency of a wave due to relative motion between source and observer is called what?
136What is the SI unit of electric charge?
137What is the SI unit of electric potential difference, or voltage?
138What is the SI unit of electrical resistance?
139According to Ohm law, voltage across a conductor equals current multiplied by what?
140Materials that allow electric current to pass through them easily are called what?
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