A stretched wire of vibrating length L has a frequency of 350 Hertz when set into resonance. When the length of the wire is increased by 15cm at constant tension, the wire vibrates with a frequency of 280 Hertz at resonance. Find the value of L​

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.