Question

Help me with science thanks!

Answer 1

1. An electromagnetic wave in a vacuum has a wavelength of 0.07 m. What is its frequency? (1 point)
f = 3.0 • 108 m/s
f = 4.3 • 109 Hz
f = 3.0 • 109 Hz
f = 4.3 • 108 m/s
2. Which of the following occurs as light travels farther from its source? (1 point)
Far from the source, photons come together in a small area.
The intensity of light increases as photons move away from the source.
The source gives off less light as photons move away from it.
Far from the source, photons spread over a larger area.
3. Infrared rays have a shorter wavelength than (1 point)
ultraviolet rays.
X-rays.
radar waves.
gamma rays.
4. In order of increasing light-transmitting capabilities of materials, which is the correct sequence? (1 point)
transparentopaquetranslucent
opaquetransparenttranslucent
opaquetranslucenttransparent
translucenttransparentopaque
5. Which of the following occurs as a light wave bends when it passes from one medium into another? (1 point)
constructive interference
refraction
destructive interference
reflection

Answer 2

1 -
\[c = f \times \lambda \]
c = speed of light in meters/sec
f = frequency in Hz
λ = wave length in meters

Answer 3

2 -
Mind game. You have a flash light. does the light spread or focus to a point smaller than the flash light lens? Even a laser pointer, smaller? or same size or larger?

Is the light brighter farther away from the flash light? Even with the laser pointer brighter or the same at best?

Assuming your battery is not running down on your flashlight or laser pointer. Does the brightness dim as you shine it?

The light is brightest coming right out of the flashlight, say 1,000,000 photons per second per square inch. The photons don't loose energy so the light is dimmer farther away because they is less photons in each unit of area.

Answer 4

3 -
http://thenanoage.com/images/EM_Spectrum_Properties.png

Answer 5

4 -
http://www.thefreedictionary.com/

Answer 6

5 -
Let's do this one by the process of elimination.
"Bends as it passes from one medium to another."

Reflection is what bounces off so not that.
Constructive interference doesn't sound like bending, neither does destructive interference.
Therefore, refraction.

Check our guess on wikipedia.org or thefreedictionary.com.