RADAR signals travel at what speed?Group of answer choicesSpeed of lightMach 1HypersonicSpeed of sound

As a train starts from rest and then accelerates down the track, coming toward me faster and faster, the speed of the sound waves coming toward me will be:Select one:a.some constant speed faster than the normal speed of sound in air.b.equal to the normal speed of sound in air.c.faster and faster.d.slower than the normal speed of sound in air.

Which travels faster, light waves or sound waves?

Question 7Speed of Sound Through Different MaterialsMaterial Approximate Speed (m/s)Air (20°C)      350Glass   5,600Steel   5,900Water (25°C)   1,500Rubber   1,600Diamond 12.000Iron   5,100 Based on the figure shown, sound waves travel most slowly through which of the following?Multiple choice question.A)airB)glassC)rubberD)water

RADAR measures speed by which principle?Group of answer choicesSynthetic apertureDoppler effectRadar Cross Section (RCS)Range and bearing

A radar is able to detect the reflected waves from an enemy aeroplane after a time interval of 0.02 millisecond. If the velocity of the waves is  3 × 108ms−1 , calculate the distance of aeroplane from the radar (in  km  ).