Two train whistles, and , each have a frequency of 392 hz. is stationary and is moving toward the right (away from ) at a speed of 35.0 m/s. a listener is between the two whistles and is moving toward the right with a speed of 15.0 m/s no wind is blowing. (a) what is the frequency from as heard by the listener? (b) what is the frequency from as heard by the listener? (c) what is the beat frequency detected by the listener?

Part a)

f = 371.1 Hz

Part b)

f = 417.7 Hz

Part c)

beat frequency = 46.6 Hz

Explanation:

Part a)

Due to doppler's Effect the frequency of the sound heard by the train which is moving away from the observer is given as

Part b)

Now from the second train which is approaching the person we can say

Part c)

As we know that beat frequency is the difference in the frequency from two sources

the following is queen elizabeth’s purposes:

- to encourage the parliament that the technique of picking successors to the seat based merely on birthright needs to be reviewed.

- (not) to convince the parliament that her kid should not be measured as a likely choice for heir to the english power.

- to persuade the parliament that merely since she has a child does not assure that the kid will be a capable leader.

- to sway the parliament how shattering it could be if they proceeded discourteously concerning her or her child.