Question

1. A transformer for an answering machine takes an ACvoltageof 170 V. (maximum, or peak-to-peak) as its input andprovides 7.8V (rms) as its output to the answering machine.

A) What is the rms equivalent to thispeak-to-peakvoltage?

B) Calculate the turns ratio between the primaryandsecondary.

C) When not answering, the machine uses a maximum power of5.0W. What is the current (rms) drawn from the 170 V line?

2. An astronomer is making an observation of anew-discoveredgalactic object. Part of this observation is theanalsis of thelight emitted by the object. It is observed that thislightincludes a clear pattern of the emission spectrum ofatomichydrogen.

Part of that spectrum is the Hα line, which on earth hasawavelength of 656.258 nm

(10^-9m). The observed light from this objecthasthis spectral line measured at 659.0 nm.

Explain this discrepancy, quantitatively, using theDopplerEffect.

thank you. Please help me.