Astronomy subject question: pls help me ;-;

Which of the following statements about light waves is correct?
1.As the frequency increases, the wavelength
decreases.

2.As the frequency increases, the wavelength
increases.

3.Changing the frequency has no effect on
wavelength.

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.

A58-kg boy swings a baseball bat, which causes a 0.140-kg baseball to move toward third base with a velocity of 38.0 m/s.

What sort of waves exhibit the doppler effect?