Why does sound travel faster on a rainy day than or a dry day? If the space inside an atom is not a vacuum, then what is it? Explain the physics concept to why a ship sounds when moving in water? 1. Why can't we hear the sound of aeroplane in the nights? 2. Why we are abl...
To get to the bottom of this question, we need to look at two important factors: How sound travels, and what's actually out there in space. Once we have this information, we should be able to tell if humans can really hear in space. So how does sound travel? Keep reading to...
(travel) faster than sound. 相关知识点: 试题来源: 解析 1.travels 考查动词时态。根据句子结构,该宾语从句是叙述永恒不变的 "真理" ,时态应为一般现在时, "light" 是主语,所以谓语动词应为三单形式 "travels" 。句意:过去的人们不知道为什么光比声音传播得快。故正确答案为:travels。
解析 travels 本题考查宾语从句的时态。在宾语从句中,当从句描述的是客观真理、自然现象等时,无论主句是什么时态,从句都要用一般现在时。“光比声音传播得快” 这是一个客观事实,所以即使主句 “wanted” 是一般过去时,从句中 “travel” 仍要用一般现在时的第三人称单数形式 “travels”。
Since light is electromagnetic wave and do not require any meterial medium for its propagation. Hence it can travel in vacuum. And sound is a mechanical wave and requires a meterial medium for its propagation. Hence sound cannot travel in vacuum.
Why does sound travel well on a quiet summer night? Why study astronomy? Why does two individual sources can never be coherent? (Wave theory) Why does mass increase with Velocity (speed of light)? Why are all quasars so far away, and hence existing only in the far di...
Why does my phone turn off by itself?There are several reasons why a phone may power off or turn the screen off. Try out the tips below which may help solve the problem.Check if the phone is in Sleep modeFirst, check if the phone is actually powered off by pressing the POWER button...
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HTC 10 Google Assistantis available for phones runningAndroid6.0 and later. Before you can say "OK Google" to launchGoogle Assistant, you need to set it up and teach it to recognize your voice. To set upGoogle Assistant, connect your phone to the Internet and then press and ...