« previous next »

Author Question: A layer of insulating material with thermal conductivity K is placed on a layer of another material ... (Read 257 times)

lidoalex

  • Hero Member
  • *****
  • Posts: 538
on: Jul 27, 2018
A layer of insulating material with thermal conductivity K is placed on a layer of another material of thermal conductivity 2K. The layers have equal thickness. What is the effective thermal conductivity of the composite sheet?
 
  A) 1.5K
  B) 3K
  C) K/3
  D) 2K/3
  E) K/5

Question 2

The radioactive isotope 226Ra (atomic number 88 ) decays to the isotope 222Rn (atomic number 86). What type of radioactive decay is this?
 
  A) beta decay
  B) electron ionization
  C) electron capture
  D) alpha decay


jamesnevil303

  • Sr. Member
  • ****
  • Posts: 337
Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Did you know?

Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

Did you know?

More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

Did you know?

Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.

Did you know?

In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

Characteristics of burns by depth of thermal injury Characteristics of burns by depth of thermal injury
Categories of Mammalian Thermal Receptors Categories of Mammalian Thermal Receptors
A Layer Based on Electrical Properties: The Ionosphere A Layer Based on Electrical Properties: The Ionosphere
Paleocene-Eocene Thermal Maximum Paleocene-Eocene Thermal Maximum
The effect of thermal expansion The effect of thermal expansion
Hazardous Material Vector Icon Hazardous Material Vector Icon
Video: Lipid catabolism - lipolysis and beta oxidation and oxidation of fatty acids

For a complete list of videos, visit our video library