What is the approximate velocity of a radio wave in free space?
150,000,000 meters per second
300,000,000 meters per second✓Правильный ответ
300,000,000 miles per hour
150,000,000 miles per hour
Объяснение
Electromagnetic waves in free space travel at very close to 300,000,000 metres per second, so radio waves have that same velocity. The answers given in miles per hour use the wrong units entirely.