Science & Mathematics - 11 January 2007

what do i need to do to solve this question


The laser in a compact disc player uses light with a wavelength of 720 nm. Calculate the energy of this radiation in joules per photon.
_____ J/photon
Calculate the energy of this radiation in kilojoules per mole of photons
.______ kJ/mol

2007-01-11 07:40:11 · 2 answers · asked by Krazyk78 1 in Chemistry

2007-01-11 07:40:02 · 16 answers · asked by Diane G 1 in Astronomy & Space

what effect will this have on the production of fruits and vegetables and such... trees are blossoming while the rains are yet to come...

2007-01-11 07:36:20 · 2 answers · asked by bilko_ca 5 in Weather

Wouldn't the total distance travelled be less because the plane is closer to the earth, making its circumfrance shorter....

Does this logic make sense? The closer to the ground you travel, the less distance covered?

2007-01-11 07:35:39 · 7 answers · asked by Anonymous in Mathematics

If tv signals travel into space forever, then could you use an existing satellite or probe to pick up that signal and send it back to you?

2007-01-11 07:35:07 · 7 answers · asked by david g 2 in Astronomy & Space

Write inequality statements that relate the exterior and remote interior angles

2007-01-11 07:33:58 · 1 answers · asked by brighton 3 in Mathematics

2007-01-11 07:33:23 · 4 answers · asked by zebbie g 2 in Astronomy & Space

2007-01-11 07:30:05 · 11 answers · asked by juno 4 in Chemistry

those two lines next to x and 8 are integer marks

2007-01-11 07:28:53 · 3 answers · asked by Sophie - 1 in Mathematics

simplify the expression

2007-01-11 07:28:43 · 1 answers · asked by Anonymous in Mathematics

2007-01-11 07:28:04 · 7 answers · asked by Katy 3 in Engineering

do u have any ideas of what to present in a science fair? the theme is Science and Technology for reduction of poverty?

2007-01-11 07:26:19 · 13 answers · asked by cookiecracker 2 in Other - Alternative

Ok seriously I am having a huge math brain block.

A committee is formed to investigate what activities teenagers have available in small communities. The committee is to have 7 members, chosen randomly from interested community members. There are 10 Parents, 5 teens, and 4 adults with no children. All have expressed interest.

What is the probability that the adults no children all end up on the committee. Express to the nearest 10th of a percent.

So far I have
PA=10
PB=5
PC=4
I have no idea where to go

2007-01-11 07:25:54 · 4 answers · asked by gg 4 in Mathematics

How do they d iffer...

angola....is the highest

singapore.....is the lowest

2007-01-11 07:25:46 · 3 answers · asked by linifer74 1 in Geography

earth is close to the sun..so we experience night and day due to its move...but what about pluto for example who is way far..does it have the same fact..???

2007-01-11 07:24:38 · 13 answers · asked by PLUTO 6 in Astronomy & Space

2007-01-11 07:23:51 · 4 answers · asked by FuturePirate 3 in Weather

Human VNTR locus contains a tandem repeat of four nucleotides, (CGGT)n, where n may be any value between 7 and 22. How many different alleles of this locus would you expect to find in the human population? How many genotypes are possible?

2007-01-11 07:23:22 · 1 answers · asked by nick 1 in Biology

2007-01-11 07:22:54 · 6 answers · asked by Anonymous in Zoology

some species of lungfish breathe only air; they have no gills, and will drown if forced underwater. why might it be an advantage for a lungfih to breathe air even though they live water????

2007-01-11 07:22:04 · 1 answers · asked by Anonymous in Biology

2007-01-11 07:21:40 · 2 answers · asked by LyDia W 1 in Physics

Detailed question:

Two cars - Car A is going 100 km/h and Car B going 50 km/h

Both have a mass of 1000 kg

How fast is Car A going when Car B stops using breaks? Car A also presses on the breaks --- breaks are pressed at the same time.

Everything is a controlled variable except for the speed.

How do i figure this out using kinematics equations?

All I have is that the car's both have a mass of 1000kg and Car A is travelling at 100 km/h and car B is travelling at 50 km/h

2007-01-11 07:21:31 · 4 answers · asked by Anonymous in Physics

How do you find this answer ? Please tell me step by step.

2007-01-11 07:21:31 · 3 answers · asked by compscience01 1 in Mathematics

2007-01-11 07:19:20 · 5 answers · asked by flawlessn 1 in Mathematics

How do i turn 8(1/3)% into a fraction? Please show me step by step.

2007-01-11 07:18:41 · 5 answers · asked by compscience01 1 in Mathematics

2007-01-11 07:17:31 · 9 answers · asked by Brian S 2 in Weather

Can I hold a praying mantis in my hand?
Are there some species that are poisonous?

2007-01-11 07:17:05 · 15 answers · asked by fespinal4444 2 in Zoology

2007-01-11 07:15:41 · 8 answers · asked by aleeza l 1 in Mathematics

2007-01-11 07:15:39 · 2 answers · asked by Brian S 2 in Weather

Help is appreciated.

2007-01-11 07:15:07 · 3 answers · asked by Random G 3 in Chemistry

1. r^2/ r^2-s^2 multiplied by r-s/r+s divided by (r/r+s)^2

2.(2p-7/9)^3 divided by (7-2p/3)^4


Thanks everybody!! :)

2007-01-11 07:08:59 · 4 answers · asked by Anonymous in Mathematics