Here are the answers based on the questions provided:
Question 1:
Waves P and Q have the same __________, but wave P has twice the __________ of wave Q.
Answer: wavelength, amplitude
Question 2:
The distance from one crest to the next crest is the __________.
Answer: wavelength
Question 3:
Waves Q and R have the same __________, but wave R has twice the __________ of wave Q.
Answer: frequency, wavelength
Question 4:
Which type of wave needs a medium to travel?
Answer: mechanical wave
Question 5:
Waves __________ and __________ have a low amplitude and a steady frequency.
Answer: P, Q
Please note that the answers were based on typical wave characteristics, and the assumptions were made due to the lack of visual reference for the illustrations mentioned in the questions.