Aeroplane
Light waves
Ship
Sound waves
Answer is Right!
Answer is Wrong!
The correct answer is C. Ship.
A knot is a unit of speed equal to one nautical mile per hour. It is commonly used to measure the speed of ships and boats. One nautical mile is equal to 1.852 kilometers or 1.150778 miles.
Option A is incorrect because aeroplanes are not measured in knots. They are typically measured in miles per hour or kilometers per hour.
Option B is incorrect because light waves are not measured in knots. They are typically measured in meters per second or kilometers per second.
Option D is incorrect because sound waves are not measured in knots. They are typically measured in meters per second or kilometers per second.