Answer : The correct answer for 'd' is B The Wavelength and 'c' is A the amplitude.
'd' is showing the distance between two peaks of a wave which is a wavelength . Wavelength is defined as distance between two similar part of a wave like distance between two peaks or two troughs . It is also known as length of one full wave or one full oscillation of a wave .So 'd' is B the wavelength .
'c' shows the height of the peak . The height of the peak is called as Amplitude of wave which is defined as the vertical distance between the central line (resting position of wave )and peak or trough . Hence 'c' presents Amplitude of the wave .So correct option for 'c' is A the amplitude
