Which of the following phenomena is not commonly associated with the star formation process?
A) strong winds of particles blowing out into space from a protostar
B) powerful jets shooting out along the rotation axis of a protostar
C) the formation of a spinning disk of material around a protostar
D) intense ultraviolet radiation coming from a protostar
Question 2
The frequency of a wave is
A) measured in hertz (Hz).
B) measured in cycles per second.
C) equal to the speed of the wave divided by the wavelength of the wave.
D) the number of peaks passing by any point each second.
E) all of the above
