This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A substance has a melting point of 20C and a heat of fusion of 3.5 104 J/kg. The boiling point is ... (Read 110 times)

clmills979

  • Hero Member
  • *****
  • Posts: 551
on: Jul 29, 2018
A substance has a melting point of 20C and a heat of fusion of 3.5  104 J/kg. The boiling point is 150C and the heat of vaporization is 7.0  104 J/kg at a pressure of 1.0 atm.
 
  The specific heats for the solid, liquid, and gaseous phases are 600 J/(kgK), 1000 J/(kgK), and 400 J/(kgK), respectively. The quantity of heat given up by 0.50 kg of the substance when it is cooled from 170C to 88C, at a pressure of 1.0 atmosphere, is closest to
  A) 30 kJ. B) 70 kJ. C) 44 kJ. D) 21 kJ. E) 14 kJ.

Question 2

A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV.
 
  What is the threshold frequency for photoelectron production? (h = 6.626  10-34 J  s, 1 eV = 1.60  10-19 J)
  A) 6.8  1014 Hz
  B) 2.7  1014 Hz
  C) 7.6  1014 Hz
  D) 8.5  1014 Hz
  E) 9.4  1014 Hz


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

mariahkathleeen

  • Sr. Member
  • ****
  • Posts: 337
Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

A


clmills979

  • Member
  • Posts: 551
Reply 2 on: Jul 29, 2018
Wow, this really help

atrochim

  • Member
  • Posts: 331
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

Did you know?

Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

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?

Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.

Did you know?

The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

Visualization of heat exchange in an ectotherm and an endotherm. Visualization of heat exchange in an ectotherm and an endotherm.
Marijuana Use and Binge Drinking in Emerging Adulthood Rates of most kinds of substance use peak in Marijuana Use and Binge Drinking in Emerging Adulthood Rates of most kinds of substance use peak in
The left-hand rule states that if a coil is grasped with the left hand, the fingers will point in ... The left-hand rule states that if a coil is grasped with the left hand, the fingers will point in ...
Set-Point Theory Set-Point Theory
Four 2.0-µC point are at the corners of a rectangle with sides of length 3.0 cm and 4.0 cm. ... Four 2.0-µC point are at the corners of a rectangle with sides of length 3.0 cm and 4.0 cm. ...
Relationship Between the Atlas and the Axis. The Dens of the Axis Provides a Pivotal Point Around Wh Relationship Between the Atlas and the Axis. The Dens of the Axis Provides a Pivotal Point Around Wh
Video: Pericarditis

For a complete list of videos, visit our video library