Question

An enemy plane is at a distance of 300km from a radar. In how much time radar will be able to detect the plane? Take velocity of radio waves as 3X10 raise to power 8 m/s.

Answer 1

Answer:

0.001 seconds

Explanation:

Given :

• An enemy plane is at a distance of 300 km from a radar source

• The velocity of the radio waves from the radar come at a speed of 3×10^8 m/s

To find :

• After how much time the radar will be able to detect the plane

1 km= 1000 metres

300 km = 300×1000 = 300000 metres = 3×10^5 metres

Time = distance / speed

Time = 3×10^5/3×10^8

Time = 1/1000

Time = 0.001 seconds

The radar will detect the enemy plane in 0.001 seconds

Answer 2

Answer:

Given:

• An enemy plane is at a distance of 300km from a radar. Take velocity of radio waves as 3 × 10 raise to power 8 m/s.

Find:

• In how much time radar will be able to detect the plane?

Using formula:

★ ${\sf{\underline{\boxed{\orange{\sf{Time = \dfrac{Distance}{Speed} }}}}}}$

Calculations:

• We know that 1 km is equal to 1000 m, so in the question it's given that 300 km that's equal to 300 × 1000 we get 300000 m, Taking that in power we get 3 × 10^5 m. Let T be time.

⇒ $\bold{T = 3 \times 10^{5/3} \times 10^{8}}$

⇒ $\bold{T = \dfrac{1}{1000}}$

⇒ ${\sf{\underline{\boxed{\red{\sf{T = 0.001 \: sec}}}}}}$