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Vaselesa [24]
2 years ago
10

A metal detector used in airports is actually a large coil of wire carrying a small current. Explain how it detects a gun, even

if it is wrapped in towels in a suitcase.
Physics
1 answer:
Alexus [3.1K]2 years ago
8 0

<u>Metal detectors work by transmitting an electromagnetic field from the search coil into the ground. Any metal objects (targets) within the electromagnetic field will become energised and retransmit an electromagnetic field of their own. The detector’s search coil receives the retransmitted field and alerts the user by producing a target response. metal detectors are capable of discriminating between different target types and can be set to ignore unwanted targets. </u>

1. Search Coil

The detector’s search coil transmits the electromagnetic field into the ground and receives the return electromagnetic field from a target.

2. Transmit Electromagnetic Field (visual representation only - blue)

The transmit electromagnetic field energises targets to enable them to be detected.

3. Target

A target is any metal object that can be detected by a metal detector. In this example, the detected target is treasure, which is a good (accepted) target.

<em>hope this helps PLEASE MARK AS BRAINLIEST:)</em>

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You are trying to overhear a juicy conversation, but from your distance of 20.0 m , it sounds like only an average whisper of 30
12345 [234]

Answer:

r₂ = 0.2 m

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given,

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new frequency = 80 dB

using formula

\beta = 10 log(\dfrac{I_1}{I_0})

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80 = 10 log(\dfrac{I_2}{10^{-12}})

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