Answer the questions 6
7:07 AM
P62 - (4 questions)
Which travels faster: sound or light?
Sound
Which wave creates pressure: sound or lights?
Sound
Which waves travel further through air: sound or light?
Light
Which waves travel further through sea water: sound or light?
Sound
P64 - (3 questions)
What's special about laser light?
A laser amplifies light using a special material - s crystal such as a ruby, or a gas, such as, CO2 - formed into a cylinder with mirrors at each end.
How are lasers used?
Lasers are used in communication in many ways, such as scanning bar codes at checkout lines, transferring information by reading CDs and DVDs, and tapping the fiber optic backbone of phone and Internet services, explains Nicholas Gerbis on Howstuffworks
Can you name two materials that are used to generate laser lights?
This material can be excited to a semi-stable state by light or an electric discharge. The material can be a crystal, glass, liquid, dye, or gas as long as it can be excited in this way.
P65 - (2 questions)
What other applications use lasers?
Many scientific, military, medical and commercial laser applications have been developed since the invention of the laser in 1958. The coherency, high monochromaticity, and ability to reach extremely high powers are all properties which allow for these specialized applications.
A one-watt laser can be purchased legally on the internet. The power is only 1/60th of a standard light bulb. Why do you think this device could be dangerous?
P67 - (3 questions)
The Hubble Telescope cost $2.5 billion. Do you believe this is a good use of money? Why / why not?
The Hubble Space Telescope (HST) is a space telescope that was launched into low Earth orbit in 1990, and remains in operation. Although not the first space telescope, Hubble is one of the largest and most versatile, and is well known as both a vital research tool and a public relations boon for astronomy.
Why do we need to know more about our inverse?
Roughly eighty percent of all the mass in the Universe is made of dark matter – a mysterious invisible substance responsible for the structure of galaxies and the patterns of the cosmos on the very largest scales.
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