Question

8. A parallel plate capacitor consists of two square parallel plates separated by a distance d. If I double the potential across the plates, while keeping everything else constant, what happens to the energy stored in the capacitor? A) There will be % of the energy stored B) There will be % of the energy stored C) The energy stored will remain constant D) The energy stored will double E) the energy stored will quadruple MMMMMMMM 9. The picture on the right shows an instrument called a pan flute (or panpipes). It consists of a collection of hollow pipes that are open at one end. To make a note, the musician blows across the top of the instrument. Which pipe will produce the lowest note? A) The shortest pipe on the right end B) The longest pipe on the left end C) There is no way to tell by looking at it 10. The highest note on an 88 key piano is a C note at 4186 Hz. The lowest is an A note at 27.5 Hz. Which key will produce a sound wave with the shortest wavelength? A) The C note at 4186 Hz B) The A note at 27.5 Hz C) The wavelength doesn't depend on the note.

Answer 1

Einkel - 1 cuz Enew = 2 2 C C2002 V ceuro 4 (E) Energy stored will quadruple. (9) velocity & Length of pipe s fra Lange of pipe - fa tenght of pipe. .: domest note will be produced by Ls) longest pipe on the left and (10) using r=fd s ad : Shortest havelength will be produced by Las the c note at (C) C = CA - 10 до 4 + Ооя роль is doubled, in Arla 90 he coa 4 tih-) and hence Capacitance will increase by 4 times iQ=CV aag : Charge stored will geadruple 4186 HZ

(7) c= EoA - ca If we double the distance 'd', i Capacitance will be reduced - to half. Also o=er 020 .. Charge stored on capacitar will be ţ of the initial charge.

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