1. Answer the following questions: a. A space probe approaching the Earth communicates with the control center on Earth via radio waves. The speed of the space probe is 24 km/s and the frequency of the radio wave it emits is 150 MHz. Calculate the wavelength of the radio wave sent from the space probe. b. On the following diagram, the wavefronts of the emitted signal from the probe when it is stationary are shown. Probe at rest Moving probe - On the diagram above, sketch the wavefronts of the emitted signals by the probe when it is moving in the direction shown. c. Determine the difference between the frequency observed at the command center and the frequency radiated from the source