A high-pitched sound has a higher frequency than a low-pitched sound.[30]Humans hear sounds that have frequencies from about 20 hertz to 20,000 hertz. Sound with a frequency higher than 20,000 hertz is called ultrasound which is too high-pitched for humans to hear. However, many animals ...
mechanical phenomenon - a physical phenomenon associated with the equilibrium or motion of objects ultrasound - very high frequency sound; used in ultrasonography 4. sound - the sudden occurrence of an audible event; "the sound awakened them" happening, natural event, occurrence, occurrent - an eve...
C.Through their varied swimming gestures. D.Through the echolocation. 相关知识点: 试题来源: 解析 A 选项中的through…sounds/gestures表明,本题考查做某事的方式。短文中提到,海豚和齿鲸是通过多种高频声音(throughawidevarietyofhigh—frequencysounds)来交流的,故答案为A)。反馈 收藏 ...
b. Explain why the high-frequency sounds cannot be heard clearly when the central speaker is behind the screen, although the low-frequency sounds from the sub-woofer can be heard. 相关知识点: 试题来源: 解析 The high frequencies have a wavelength much less than the width of the TV (for ...
【题目】Dogs can hear very high frequency sounds , _ peoplecan^4t . 相关知识点: 试题来源: 解析 【解析】答案:which.考查单词填空.根据句意及句子结构,要填入which,先行词very high frequency sounds在定语从句中作hear(can't后省略了hear)的宾语,用关系代词which. 反馈 收藏 ...
解析 答案:which.考查单词填空.根据句意及句子结构,要填入which,先行词very high frequency sounds在定语从句中作hear(can't后省略了hear)的宾语,用关系代词which. 狗能听到很高频率的声音,这是人类听不到的. 反馈 收藏
High Frequency Sounds 4+ Leafgreen Conçu pour iPad 4,1 • 15 notes Gratuit Captures d’écran iPad iPhone Description 听各种高频率的声音! 一个声音的音高是由声波频率决定。这些高频率的声音被迅速声波震动制成,而缓慢的振动创造低沉的声音。 随着年龄的增长,你的听觉能力下降,使你能少听到高音调...
B.Through a wide variety of low-frequency sounds.C.Through a narrow range of high-frequency sounds.D.Through a narrow range of low-frequency sounds. 相关知识点: 试题来源: 解析 A [听力原文]How do the dolphins and toothed whales communicate ...
And it was also noted that there was a large difference in the sound pressure levels measured by different sound level meters, mainly due to the frequency characteristics above 10 kHz of the microphones. Subjective impression was examined using the train noise with and without the high-frequency ...
The 260 rasps that were measured contained frequencies between 344 and 34 000 Hz with an average peak frequency of 3409 Hz. The frequency structure of ticks within rasps was highly variable and included both positive and negative trends. This finding makes sablefish one of the few deep-sea ...