Physics GK 15 - Mechanical & Electromagnetic Waves

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1.
Which among the following waves are most commonly used in the Night Vision Devices?
2.
Which among the following waves are used in the gemstone industry to change white topaz into blue topaz?
3.
Which of the following waves is called compression-dilation waves or longitudinal waves?
4.
The X-ray crystallography mainly uses which among the following properties of electromagnetic radiation?
5.
Which among the following Radio frequencies are used around the world in air navigational system?
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