« previous next »

Author Question: Each photon in a beam of light has an energy of 4.20 eV. What is the wavelength of this light? (c = ... (Read 96 times)

HCHenry

  • Hero Member
  • *****
  • Posts: 591
on: Jul 29, 2018
Each photon in a beam of light has an energy of 4.20 eV. What is the wavelength of this light? (c = 3.00  108 m/s, h = 6.626  10-34 J  s, 1 eV = 1.60  10-19 J)
 
  A) 321 nm
  B) 103 nm
  C) 296 nm
  D) 412 nm
  E) 420 nm

Question 2

The earth's orbit has a mean radius of 1.5  108 km. Over a six-month period, the apparent position of a particular star varies by 0.00014 due to parallax.
 
  How many kilometers is this star from Earth?
  A) 1.2  1017 km B) 1.2  1014 km C) 1.2  1020 km D) 1.2  1011 km


tennis14576

  • Sr. Member
  • ****
  • Posts: 334
Reply #1 on: Jul 29, 2018
Answer to Question 1

C

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Patients should never assume they are being given the appropriate drugs. They should make sure they know which drugs are being prescribed, and always double-check that the drugs received match the prescription.

Did you know?

If all the neurons in the human body were lined up, they would stretch more than 600 miles.

Did you know?

The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.

Did you know?

The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

Did you know?

Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

Hydrogen sulfide as an energy source for chemoautotrophic bacteria in the deep sea. Hydrogen sulfide as an energy source for chemoautotrophic bacteria in the deep sea.
Energy budget for a temperate deciduous forest (data from Gosz et al. 1978). Energy budget for a temperate deciduous forest (data from Gosz et al. 1978).
Metabolic pathways involved in lipolysis, the breakdown of fats (triglycerides) for energy. Metabolic pathways involved in lipolysis, the breakdown of fats (triglycerides) for energy.
Energy is released from the breaking of the phosphate bond in ATP when converting to ADP. Energy is released from the breaking of the phosphate bond in ATP when converting to ADP.
Apply passive touch over the eyes and cheeks to finish. Place the hands, using very light pressure, ... Apply passive touch over the eyes and cheeks to finish. Place the hands, using very light pressure, ...
Global energy imbalance ~0.75 Wm-2 Global energy imbalance ~0.75 Wm-2
Video: Exocytosis - secretion

For a complete list of videos, visit our video library