Humans can hear frequencies as low as 21 hz. if sound is measured during 3 seconds how many wavelengths pass?

Which statement best describes who the period and frequency of electromagnetic was change between gamma rays and microwaves? a) the period and frequency stay the same. b) the period increases and the frequency decreases. c) the period decreases and the frequency increases. d) the period increases and the frequency increases.

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

However, had it been a real sound, the sound's pitch would have been increased by the doppler effect, since the falcon was moving the source of the sound. perpendicular to away from towards at the same speed as