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EM Waves


It takes light 20 min to travel from Mars to Earth. How might this affect a conversation between an astronaut on Mars and people on Earth? Explain. Suppose an ultra-powerful telescope were used for visual communication. Would this telescope speed things up? Why?

Wave length/frequency/speed of sound & EM waves

(See attached file for full problem description) --- 20.25 Part A : At 20 degree C, what is the frequency of a sound wave in air with a wavelength of 17.0 cm ? Part B : What is the frequency of an electromagnetic wave with a wavelength of 17.0 cm ? Part C : What would be the wavelength of a sound wave in water t

Electromagnetic waves

The average intensity of sunlight reaching the earth is 1390 W/m^2. A charge of 2.6 x 10^-8 C is placed in the path of this electromagnetic wave. (a) What is the magnitude of the maximum electric force that the charge experiences? (b) If the charge is moving at a speed of 3.7 x 10^4 m/s, what is the magnitude of the maximum m

Child Development and Families in Transition

1. If a child's temperament is not a good "fit" with the temperament of is caregiver, how can this slow down his socialization? 2. How do a person's peers socialize him? 3. What are the three broad categories of temperament people can have? 4. List several of the rather scary, ecological trends of society that challeng

Brief description and analysis of Coca-Cola (2005)

See file attached for the questions. The textbook does not include the information about Coca-Cola, but the textbook's name is given (might help with the solutions for the questions asked). Thanks THE MANAGEMENT FRAMEWORK Textbook: Mullins, LJ 2002, Management and organizational behavior, 7th edition, Harlow; Financia

Skin Depth in Sea Water

I'm working on this sample problem and am totally lost. "A vehicle located far above the survace of the sea transmits an electro-magnetic signal at the frequency f ..." (see attachment for complete problem - thanks!)

Working with Loud Speaker Systems

The theatre is putting on a new musical and they are changing from traditional rifle microphones to radio microphone system. The theatre has some concerns over doing this, they are: transmitter operation with regard to power supplies, inter-modulation problems and choice of transmitter frequency band and output power. Please