/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 79 A metal detector can detect the ... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 25: Problem 79

A metal detector can detect the presence of metal screws used to repair a broken bone inside the body. This tells us that A. The screws are made of magnetic materials. B. The tissues of the body are conducting. C. The magnetic fields of the device can penetrate the tissues of the body. D. The screws must be perfectly aligned with the axis of the device.

Short Answer

Expert verified
The correct answer is C. The magnetic fields of the device can penetrate the tissues of the body.

Step by step solution

01

Evaluate each option

Consider the properties of each option to deduce if they are related to how a metal detector works.
02

Eliminate Incorrect Options

Rule out options A and D. Option A implies that only magnetic materials can be detected which isn't accurate as metal detectors can detect various metals, not only magnetic ones. Option D is also not accurate as alignment of the screws with the device's axis doesn't determine detectability.
03

Consider remaining options

Compare option B and C. Option B suggests body tissues are conductive. While true to some degree, it doesn't directly explain the detector's ability to identify screws within the body. Conduction is about passing electricity, not detecting metal. Option C states that magnetic fields from the device can penetrate body tissues, which explains how the device can sense the metal screws, no matter where they are in the body. Magnetic fields are not typically impeded by organic matter such as human tissues.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Magnetic Fields
Metal detectors operate using magnetic fields. These invisible fields are created by electrical currents and are capable of influencing other nearby electronic or magnetic objects. When metal detectors near a metal object, like screws from medical procedures, their magnetic field induces tiny electric currents within the metal. These currents generate their own magnetic field, which the detector senses, alerting us to the presence of the metal.
  • Metal detectors rely on the principle of electromagnetic induction.
  • Magnetic fields are crucial for detecting metallic objects because they can penetrate non-metallic materials.
Understanding how magnetic fields interact with metals is key to grasping how metal detectors function, especially in medical contexts where they can identify foreign metallic objects inside the body.
Conductivity
Conductivity refers to a material's ability to allow the flow of electric current. While metals are typically highly conductive due to their free-moving electrons, human tissues display very low conductivity in comparison. This is because tissues are not as efficient at carrying electric currents due to their composition and structure.
Although the human body is slightly conductive (as are other organic materials), this property isn't significantly related to detecting metal with magnetic fields.
  • Conductivity involves passing electricity through a material.
  • Conductivity is not a primary factor in how metal detectors sense metal through human tissue.
Thus, the ability of metal detectors to detect metal screws inside the body comes from the penetration power of magnetic fields rather than the conductivity of tissues.
Medical Applications
Metal detectors have been adopted in various medical applications due to their non-invasive detection capabilities. They are particularly useful in cases where foreign metallic objects need to be identified without resorting to more invasive procedures. For instance, doctors can quickly locate surgical screws or plates implanted in the body.
  • Offers a non-invasive method to locate metal objects within the body.
  • Useful for detecting retained surgical instruments or implants.
This technology provides a safe, quick, and relatively affordable method for ensuring that all medical implants are in place or removed safely. Thus, it's a valuable tool in medical settings for patient care and recovery monitoring.
Body Tissues
Body tissues, composed of cells and fluids, present very little resistance to magnetic fields. Unlike dense or metallic materials that might alter or block magnetic fields, tissues allow these fields to pass through with ease. This characteristic is why metal detectors can effectively recognize metal screws or implants nestled within the body.
  • Tissues are permeable to magnetic fields, enabling detection of internal metal objects.
  • They do not interfere with magnetic field penetration, ensuring accurate metal detection.
Understanding the nature of body tissues and their interaction with external fields helps in grasping why medical professionals rely on this technology to locate metal objects inside the human body.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

People immersed in strong unchanging magnetic fields occasionally report sensing a metallic taste. Some investigators suspect that motion in the constant field could produce a changing flux and a resulting emf that could stimulate nerves in the tongue. We can make a simple model to see if this is reasonable by imagining a somewhat extreme case. Suppose a patient having an MRI is immersed in a \(3.0 \mathrm{T}\) field along the axis of his body. He then quickly tips his head to the side, toward his right shoulder, tipping his head by \(30^{\circ}\) in the rather short time of 0.15 s. Estimate the area of the tongue; then calculate the emf that could be induced in a loop around the outside of the tongue by this motion of the head. How does this emf com- pare to the approximately \(15 \mathrm{mV}\) necessary to trigger an action potential? Does it seem reasonable to suppose that an induced emf is responsible for the noted effect?

A delivery truck with 2.8-m-high aluminum sides is driving west at \(75 \mathrm{km} / \mathrm{h}\) in a region where the earth's magnetic field is \(\vec{B}=\left(5.0 \times 10^{-5} \mathrm{T},\right.\) north \()\) a. What is the potential difference between the top and the bottom of the truck's side panels? b. Will the tops of the panels be positive or negative relative to the bottoms?

Unpolarized light passes through a vertical polarizing filter, emerging with an intensity \(I_{0}\). The light then passes through a horizontal filter, which blocks all of the light; the intensity transmitted through the pair of filters is zero. Suppose a third polarizer with axis \(45^{\circ}\) from vertical is inserted between the first two. What is the transmitted intensity now?

What is the wavelength of a photon whose energy is twice that of a photon with a 600 nm wavelength?

A radio antenna broadcasts a \(1.0 \mathrm{MHz}\) radio wave with \(25 \mathrm{kW}\) of power. Assume that the radiation is emitted uniformly in all directions. a. What is the wave's intensity \(30 \mathrm{km}\) from the antenna? b. What is the electric field amplitude at this distance?
See all solutions

Recommended explanations on Physics Textbooks

Famous Physicists

Read Explanation

Physical Quantities And Units

Read Explanation

Measurements

Read Explanation

Torque and Rotational Motion

Read Explanation

Electric Charge Field and Potential

Read Explanation

Dynamics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.