Modern system of navigation satellites called ___________?
Correct answer: B. Navstar
- A. Inertia frames of reference
- B. Navstar
- C. Proton
- D. None of these
Explanation
Navstar is the satellite navigation system developed by the United States and commonly associated with GPS. The other choices are not satellite navigation systems; students may choose none of these if they know the modern name GPS but do not recognise Navstar as its system name.
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About Electromagnetic Waves
Electromagnetic waves consist of mutually perpendicular, oscillating electric and magnetic fields that also remain perpendicular to the direction of propagation. They travel through vacuum at the speed of light and include radio waves, microwaves, infrared, visible, ultraviolet, X-rays and gamma rays. Unlike mechanical waves, they do not require a material medium.
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