Anda hanya bisa menjawab 5 dari 25 soal. Untuk bisa menjawab semua soal tryout silakan lakukan pembelian paket soal.
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Light is a kind of energy that radiates, or travels, in waves. Many different kinds of energy travel in waves. For example, sound is a wave of vibrating air. Light is a wave of vibrating electric and magnetic fields. It is one small part of a larger range of vibrating electromagnetic fields. This range is called the electromagnetic spectrum. Electromagnetic waves travel through space at 299,792 km/sec (186,282 miles/sec). This is called the speed of light. |
What is the purpose of the passage?