Radio waves travel at the speed of light . How long would it take the CIA to send a message to a spacecraft a distance of 7.5E6 m from earth? 2.5E-2 s 2.25E15 s 40 s 4.2E-2 S

## Step 1The speed of light is approximately meters per second. This is the speed at which radio waves, as a type of electromagnetic radiation, travel.## Step 2To find out how long it would take for a message to travel a certain distance, we can use the formula:### **Time = Distance / Speed**## Step 3In this case, the distance is meters and the speed is meters per second.## Step 4Substitute the given values into the formula:### **Time = m / m/s**## Step 5Calculate the above expression to get the time in seconds.