Answer:
option C (1 and 4)
Explanation:
Like poles repel each other, unlike poles attract each other
the relation that relates the speed of wave, frequency of wave and wavelength is given as
wavelength = 
the speed of wave in a medium remains constant. hence the wavelength is inversely related to the frequency of wave.
that means, as the frequency is increased, the wavelength decreases and vice versa.
hence the correct choice is
B decreases
Answer:
energy which a body possesses by virtue of being in motion.
Explanation: