![subject](/tpl/images/cats/fizika.png)
Electromagnetic Wave PenetrationRadio waves and mircowaves are used in therapy to provide "deep heating" of tissue because the waves penetrate beneth the surface of the body and deposit energy. We define the penetration depth as the depth at which the wave intensity has decreased to 37% of its value at the surface. The penetration depth is 15cm for 27MHz radio waves. For radio frequencies such as this, the penetration depth is proportional to (sqrt of lambda), which is the square root of the wavelength. What is the wavelength of 27 MHz radio waves? A. 11 m. B. 9.0 m. C. 0.011 m. D. 0.009 m. If the frequency of the radio waves is increased, the depth of penetration:.A. Increases. B. Does not change. C. Decreases. 3. For 27 MHzMHz radio waves, the wave intensity has been reduced by a factor of 3 at a depth of approximately 15 cmcm. At this point in the tissue, the electric field amplitude has decreased by a factor of:.A. 9 77. B. 3√3. C. 3. D. √3.
![ansver](/tpl/images/cats/User.png)
Answers: 3
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Physics
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 15:10
In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_
Answers: 3
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 16:30
What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?
Answers: 2
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 17:00
The force it would take to accelerate an 900-kg car at the rate of 6m/s2
Answers: 1
![question](/tpl/images/cats/fizika.png)
Physics, 22.06.2019 18:00
By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?
Answers: 1
You know the right answer?
Electromagnetic Wave PenetrationRadio waves and mircowaves are used in therapy to provide "deep heat...
Questions
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 19.10.2019 10:30
![question](/tpl/images/cats/himiya.png)
Chemistry, 19.10.2019 10:30
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/fizika.png)
Physics, 19.10.2019 10:30
![question](/tpl/images/cats/mat.png)
Mathematics, 19.10.2019 10:30
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 19.10.2019 10:30
![question](/tpl/images/cats/en.png)
English, 19.10.2019 10:30
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/biologiya.png)
![question](/tpl/images/cats/istoriya.png)
History, 19.10.2019 10:30
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/informatica.png)
Computers and Technology, 19.10.2019 10:30
![question](/tpl/images/cats/mat.png)
Mathematics, 19.10.2019 10:30
![question](/tpl/images/cats/mat.png)
Mathematics, 19.10.2019 10:30