Two train whistles have identical frequencies of 180 hz. when one train is at rest in the station, sounding its whistle, a beat frequency of 3.7 hz is heard from a train moving toward us. find the speed of the train. (take the speed of sound to be 345 m/s.)

7 m/s

Step-by-step explanation:

We are given that

Frequency at stationary =

Beat frequency=3.7 Hz

Apparent frequency=

Speed of sound=v=345 m/s

We have to find the speed of train

Apparent frequency=

Substitute the values then we get

Hence, the speed of train=7 m/s

think about it deeply and passionately about this property

i am sorry

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)