The speed of sound in aluminum is 5200 m/s. Can you hear a sound with a wavelength of 0.20 m traveling in aluminum?
Explain. (simple short explanation pls)

v = wavelength * frequency

frequency = 5200 m/s / .2 m = 26000 / sec

20,000 / sec is optimistic for the upper frequency of human hearing

So 26,000 is above the hearing range for human ears

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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its c its is a mixture of gases