Question

WA

minimum distances between the two persons?
a) 1.8 km, 0.15 km
b) 2.2 km, 0.20 km
c) 2.8 km. 0.25 km
d) 3.3 km, 0.30 km

Sound produced at a point is heard by a person after 5 second, while the same sound is heard
another person after 6 seconds. If the speed of sound is 300 m/s. what could be the maximum and​

Answer 1

the answers the correct one is d

Step-by-step explanation:

The speed of sound is constant so we can use the relations of uniform motion

v = x / t

x = v t

now let's calculate the distance for each person

t = 5s

x₁ = 300 5

x₁ = 1500 m

t = 6s

x₂ = 300 6

x₂ = 1800 m

therefore we have two possibilities

a) the two people are on the same side, therefore the distance between them is

Δx = x₂- x₁

Δx = 1800 - 1500

Δx = 300 m

let's reduce to km

Δx = 0.300 km

b) people are on opposite sides of the sound

Δx = x₂ + x₁

Δx = 1800 + 1500

Δx = 3300 m

Δx = 3.3 km

when checking the answers the correct one is d