1. Why can't we hear the sound of aeroplane in the nights? 2. Why we are able to hear smaller sound? Explain what happends when sound travel from one medium to another medium? How can a rocket change direction when it is far out in space and is essentially in a vacuum? Explain. ...
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”。
(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。
Statement 1 : Light can travel through vacuum Statement II : Light needs a medium to travel. View Solution Light waves can be polarised but sound waves cannot be. Why? View Solution Exams IIT JEE NEET UP Board Bihar Board CBSE Free Textbook Solutions ...
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...
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Maintaining a small fleet of 14 airplanes cost too much because airlines required spare parts and a team of specialized technicians to keep the plane in service. Even though we have the technology to travel at supersonic speeds, all commercial flights today move slower than the speed of sound....
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The problem isn’t just a lack of toilets—it’s a lack of toilets that people want to use. The result: millions of deaths and disease-stunted lives.
Even if you’re relatively new to marketing, I’m sure you’re familiar with the term “lead magnet.” If you’re not, it basically means creating an irresistible piece of content your target market can’t wait to trade their email address for. It usually takes the form of an eBook, ...