How does sound happen? A. When something vibrates or shakes、 B. When hitting at something、 C. When a ruler is put at the edge of the desk、 D. A and B、 相关知识点: 试题来源: 解析 A 提示:细节理解题。根据第二段第一句“But what is sound?Sound happens when something vibrates(...
Sound is produced by vibrations. When an object vibrates, it makes sound. How is sound produced? A. By colors. B. By vibrations. C. By shapes. 相关知识点: 试题来源: 解析 B。解析:声音是由振动产生的,B 选项正确。A 选项颜色和声音产生无关,C 选项形状也不是声音产生的原因。
Set a vibrate-only timer on iPhone While the stock Clock app allows setting an alarm that makes no sound and only vibrates, this isn’t true for timers. When you go to theClock app>Timer>When Timer Ends, you’ll only find tones andStop Playing. There is no option to set the timer ...
Sound is characterised as a series of waves that move through a particular medium. A medium is some sort of a subtance–whether it be water, plasma, air, a solid, or anything else–that these waves move through. The waves cause the particles in this substance to vibrate which is how the...
1. The Do Not Disturb mode will cause the phone to not ring when there is a call. 2. The phone is in silent/vibrate mode. 3. The custom ringtone audio source file may be not compatible with the phone, so the phone will not ring when there is an incoming call. ...
To understand how your ears hear sound, you first need to understand just what sound is. An object produces sound when it vibrates in matter. This could be a solid, such as earth; a liquid, such as water; or a gas, such as air. Most of the time, we hear sounds traveling through...
loud or soft. They can be pleasant or unpleasant. Animals use sound in many ways. Humans use sound to communicate their thoughts and feelings. Other animals use sound to communicate, too. Humans have invented many things to make sounds. For example, Africans use drums to...
There are plenty of other things to learn about sound, but this is what you need to know to understand LRAD systems. We'll look at how the LRAD creates sound and takes advantage of these physical properties next. The Long Range Acoustic Device and Loud Sounds An LRAD system has lots of...
Put down your hands.Ask your friend to play the piano.Can you hear the sound of the piano?Cover your ears again.What can you find now?Yes!Our ears help to"catch"the sound to make us hear something. ②You know that sound makes air vibrate(震动),and then it makes...
Sound is the energy things produce when they vibrate (move back and forth quickly).If you bang a drum, you make the tight skin vibrate at very high speed (it's so fast that you can't usually see it), forcing the air all around it to vibrate as well. As the air moves, it ...