A guitar string vibrates at 400 Hz and has a length of 0

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A guitar string vibrates at 400 Hz and has a length of 0.8 m. Find. A guitar string vibrates at 400 Hz and has a length of 0.8 m. Find the new frequency if

a. The string is lengthened to 0.9 m.

b. The string is replaced with another string, the density of which is greater by a factor of two.

c. The tension in the string is decreased by a factor of 0.4.

d. The string is replaced with another string, the diameter of which is twice as large.