AST101H1 Chapter 5: CHAPTER 5 Astro.docx

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ceriseyellowjacket700

2 Apr 2012

School

UTSG

Department

Astronomy & Astrophysics

Course

AST101H1

Professor

Michael Reid

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AST101H1 Full Course Notes

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Document Summary

Light is a form of energy and the energy it carries is called radiative energy. The other two type of energy"s are kinetic energy (energy of motion) and potential energy (stored energy) The rate of energy flow is called power and its measured in watts (1 watt = 1 joules) Humans require about 10 million joules per day (same as a 100 watt light bulb) Basic colors in a spectrum are red, orange, yellow, green, blue and violent. White is visible when all the basic colors are mixed in equal proportions. Light from the sun and light bulb is called white light because they contain all colors of the rainbow. Wide variety of colors are created by mixing colors of the spectrum in varying proportions. Primary colors of vision are red, blue and green. Alternate set of primary colors are red, yellow, blue. Cmyk (cyan, magenta, yellow and black) is used in graphics design and to print books.

Related Questions

A. How much voltage does the light bulb use up? How do you measure this value?

B. What is the change in the potential energy of a single electron as it moves through the light bulb?

C. Is this a gain or loss of potential energy?

D. Where in the light bulb gain or loss occur.

burgundyyak620

Sound and light are examples of wave motion. However,
a. sound requires a medium for transmission, whereas light doesnot.
b. light requires a medium for transmission, whereas sound doesnot.
c. both sound and light require a medium for transmission.
d. neither sound nor light require a medium for transmission.

In the electromagnetic spectrum,
a. x-rays have a higher wavelength than radiowaves
b. x-rays have a higher frequency than radiowaves
c. x-rays have a lower energy value than radiowaves
d. all waves have the same frequency

For a given force, as the distance increases
a. work increases
b. work decreases
c. inertia decreases
d. time decreases

In a hydroelectric power plant, there are transformations of
a. potential energy to kinetic energy and mechanical energy back topotential energy
b. potential energy to kinetic energy and electrical energy tomechanical energy
c. kinetic energy to potential energy and mechanical energy toelectrical energy
d. potential energy to kinetic energy and mechanical energy toelectrical energy

1. A modern color T.V. set draws 5.0 A when operated on120V.

a. How much power does the set use?

b. If the set is operated for an averageof14 h/day, What energy in KWh does it consume per month(30days)?

2. A 60.0 W light bulb is 30.0% of the electric energyisconverted to light energy.

a. How many joules does the lightbulbconvert into light each minute it is in operation?

b. How many joules of thermal energy doesthelight bulb use each minute?

Thanks in advance

AST101H1 Chapter 5: CHAPTER 5 Astro.docx

AST101H1 Full Course Notes

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