Abell with a fundamental frequency of 880 hz is moving toward an observer at 3.5 m/s. if the speed of sound is 343 m/s, what pitch would be heard by the observer?

f = 889 Hz

Explanation:

As we know that when observer and source move relative to each other

Then in that case the frequency heard by the observer is different from actual frequency

The changed in the frequency is given as

now we know that

v = 343 m/s

now we have

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.  

3. dark matter

empty space could also be a simple vacuum