The Doppler effect (or Doppler shift), named after Austrian physicist Christian Doppler who proposed it in 1842 in Prague, is the change in frequency of a wave for an observer moving relative to the source of the wave. It is commonly heard when a vehicle sounding a siren or horn approaches...
Frequency is one of the characteristics of waves such that it describes the number of cycles of waves per second. This, therefore, can be related to the wavelength of the wave, such that λ=vf, where v is the velocity of the wave and f is the frequency....
take responsibility for(doing)sth. 承担(做)某事的责任 a sense of responsibility 责任感 Our brand is damaged but no one wants to take responsibility for it. 我们的品牌受损了,却没有人愿意为此负责。句型1 There is no/little doubt that...“毫无疑问……” ...
a Hertz, a great Germanic physical scientists, he demonstrated that electromagnetic wave indeed exist in this universe in 1888, which, at the same time, also find evidence for Maxwell’s theory. Scientific community use Hertz (Hz) as the unit of frequency of electromagnetic wave. 赫兹,了不起...
mil- an angular unit used in artillery; equal to 1/6400 of a complete revolution arcdegree,degree- a measure for arcs and angles; "there are 360 degrees in a circle" arcsecond,second- a 60th part of a minute of arc; "the treasure is 2 minutes and 45 seconds south of here" ...
frequency noun ①[U, C]发生率;出现率;重复率 ②[U]频繁 ③[C, U](术语)(声波或电磁波振动的)频率 a high / low frequency 高频;低频 ④[C, U](术语)频率(无线电信号每秒电波数) studio noun ①(广播、电视的) 录音室...
The rotor consists of a permanent magnet and the stator has a series of axially mounted coils. Electricity is generated as the spring (11) assisted rotor moves up and down with the wave movement Independent claims are included for a wave power plant and for a method of generating electricity...
unit for frequency Hertz (Hz) unit for speed m/s medium Material through which a wave travels electromagnetic waves A form of energy that can move through the vacuum of space. Refraction The bending of a wave as it passes at an angle from one medium to another Reflection The bouncing back...
Radio having a recording and reproducing unit responsive to a radio wave of a predetermined frequencySetsuo Okada
What is a pendulum wave? What is the unit of density in the CGS system? What is the metric unit for time? What is marginal relative frequency? What is a joule? What is unit weight? What does m stand for in measurement? What is the formula for displacement?