There is more than one answer
2 answers:
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Answer:
1) c.
2) a.)
Explanation:
1)
- At any wave, if its waveform repeats itself every time interval T, it is said that the wave is periodic, with a period T, which is the time needed to complete an entire cycle. The other options refer at the way in the waves propagates (longitudinal or transversal) and to the type of waveform (sinusoidal), so the right answer is c).
2)
- At any wave that propagates at a constant speed, there exists a fixed relationship between the velocity v, the frequency f and the wavelength λ, as follows:
- So in order to v keep constant, if the frequency is increased, the wavelength will decrease in the same proportion, so a) is the right answer.