Author Question: A photon is A) a high-energy electromagnetic wave. B) an electron that has been ejected from a ... (Read 81 times)

MGLQZ

  • Hero Member
  • *****
  • Posts: 579
A photon is
 
  A) a high-energy electromagnetic wave.
  B) an electron that has been ejected from a metal surface by electromagnetic radiation.
  C) a particle-like quantum of radiation.
  D) one of the two types of nuclear particles.
  E) the anti-particle to the electron.

Question 2

A certain siren radiates sound uniformly in all directions. At a distance of 17 m from the siren, the intensity level is 49 db. How many watts of power does this siren put out? The threshold of human hearing is 1.0  10-12 W/m2.
 
  What will be an ideal response?



shaquita

  • Sr. Member
  • ****
  • Posts: 324
Answer to Question 1

C

Answer to Question 2

2.9  10-4 W



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

Did you know?

There are 60,000 miles of blood vessels in every adult human.

Did you know?

Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

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?

Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.

For a complete list of videos, visit our video library