A train whistle blows every 10 seconds. What is the frequency of the whistle?

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Answer 1 · 2018-04-29T07:17:48

#0.1 Hz#

Frequency is inversely proportional to time period, so:

#T=(1/f)#

#10=(1/f)#

#f=(1/10)#

So the frequency is #(1/10) or 0.1 Hz#.

This is because Hertz, or frequency is defined as "events per second". As there is 1 event every 10 seconds it has a frequency of #0.1 Hz#

Answer 2 · 2018-04-29T13:30:02

#0.1# hertz

Since the train whistle blows every #10# seconds, we can say that the period of the whistle is #10# seconds.

Frequency is inversely proportional to period, and the equation is:

#f=1/T#

#T# is the period in seconds

So here, the frequency will be

#f=1/(10 \ "s")#

#=0.1 \ "s"^-1#

#=0.1 \ "Hz"#