Homework Help: Science

Posted by Dillon on Friday, January 1, 2010 at 6:08am.

My little brother needs help on this worksheet. And I have no clue.

1. For waves that travel with the same speed, wavelengths increases as frequency ______.

2. Radiant energy decreases as _________ increases.

B1b. The radio waves from the ________ antenna can cause electrons in another piece of metal, such as a receiving antenna, to move up and down, creating an alternating current.

B1c. The ________ can be used to produce sound from the loudspeaker, allowing for the transmission of music, television shows, and telephone signals

B2. _______ have a higher frequency and shorter wavelengths than radio waves; they are used for some phone calls and to heat food.

B3. _______ uses electromagnetic waves to locate objects by measuring the time it takes for the waves to reach the object, be reflected, and return.

C. ________ have wavelengths between one thousandth and 0.7 millionths of a meter and feel warm and hot.

Science - drwls, Friday, January 1, 2010 at 6:30am
1. decreases
2. reflectivity
The answer could also be wavelength, but only in the long-wavelength limit.
B1b. transmitting
B1c. oscillations
B2. microwaves
B3. radar
C. infrared radiation (has, not have)
Science - Dillon, Friday, January 1, 2010 at 6:44am
Thanks!

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