Science & Mathematics - 6 December 2006

2006-12-06 06:49:16 · 8 answers · asked by balraj t 1 in Engineering

In its ground-state, a H atom absorbs a photon of wavelength 97.20 nm. To what energy level does its electron move?

The answer is 4.


How is this value reached?

Here's what I did:

c=(freq)(wavelength), (3x10^8)/(97.20x10^-9), so freq. = 3.09x10^15 Hz.

Then I used E=hv, (6.626x10^-34)(3.09x10^15), so E = 2.05x10^-18 J(?).

Finally, I plugged it into the energy level equation: 2.05x10^-18 = -B(1/x^2 - 1/1^2), with B = 2.179x10^-18...

The answer I got was 1 - which is incorrect!

I know I made a mistake on the last part, so could anyone please clarify?

2006-12-06 06:49:00 · 2 answers · asked by other_user 2 in Chemistry

2006-12-06 06:47:22 · 8 answers · asked by Anonymous in Astronomy & Space

Hi all, wonder if you can answer this query:.....

Was wondering exactly how far you can push your arm up a cows backside, ( like vets do) and what exactly can you feel when your inside . Would there be anything to hold onto should it decide to run around the field...Thanks

2006-12-06 06:45:45 · 14 answers · asked by pop c 2 in Zoology

2006-12-06 06:42:15 · 7 answers · asked by Anonymous in Biology

scientific name for krill?

the first one to get it right gets the best answer and yes i know the answer, i just learned it today while doing vocab xD

2006-12-06 06:41:58 · 3 answers · asked by O.o 2 in Biology

A 5.00 kg ball (ball 1), moving to the right at a velocity of +3.00 m/s on a frictionless table, collides head-on with a stationary 8.00 kg ball (ball 2). Find the final velocities of the balls if the collision is as specified below.
(a) a completely elastic collision
ball 1
______ m/s
ball 2
______m/s
(b) a completely inelastic collision
ball 1
_______m/s
ball 2
______m/s

what is the difference between completly inelastic and elastic?

2006-12-06 06:41:43 · 3 answers · asked by lifewithgooli 1 in Physics

Human changes the environment, instead of the environment changes us ( We invented AC to cool down instead of losing more hair). Does this mean we reach the end of evolution?

2006-12-06 06:40:50 · 7 answers · asked by swimandrun 1 in Biology

i am writing a paper on the future of air and space transportation i need some great idea, like i talked about super speed travel and stuff any other idea?

2006-12-06 06:40:20 · 4 answers · asked by Carpe Diem (Seize The Day) 6 in Astronomy & Space

A) explode like atomic bombs
B) overheat and melt
C) cause a steam explosion
D) spread radioactive material

please provide source

2006-12-06 06:40:09 · 5 answers · asked by Anonymous in Engineering

I read on today's paper that by 2024 there will be a moon settlement, at a cost of many billions. Why would that be any good?

2006-12-06 06:39:15 · 11 answers · asked by rubbercod 2 in Astronomy & Space

college algebra - solve

2006-12-06 06:36:24 · 6 answers · asked by j t 1 in Mathematics

2006-12-06 06:35:18 · 17 answers · asked by Claire D 1 in Engineering

2006-12-06 06:35:16 · 1 answers · asked by katie p 1 in Biology

college algebra - solve

2006-12-06 06:35:07 · 10 answers · asked by j t 1 in Mathematics

if i have a fraction and i need to simplify it into its lowest form how do i do it on a calculator?

2006-12-06 06:33:18 · 8 answers · asked by Anonymous in Mathematics

2006-12-06 06:33:00 · 13 answers · asked by Alexander S 1 in Physics

49^x+5=343^x-2

2006-12-06 06:32:50 · 6 answers · asked by katie 4 in Mathematics

What do you get when you mix nitric acid with mineral oil?

2006-12-06 06:32:50 · 1 answers · asked by Felicia 4 in Chemistry

I need a few good ways to make Carbon Dioxide for my school Science project. Can anybody list a few good ways?

2006-12-06 06:31:17 · 17 answers · asked by Pancake Man 4 in Chemistry

2006-12-06 06:28:18 · 6 answers · asked by Anonymous in Mathematics

2006-12-06 06:25:04 · 29 answers · asked by RBJ 2 in Astronomy & Space

college algebra - write the expression as a sum, difference, or product of loganthan. assum that all variables reprent positive real numbers

2006-12-06 06:24:13 · 4 answers · asked by koka 1 in Mathematics

Suppose that a man wants to cross to the far wall of a room that is 20-ft across. First, he crosses half of the distance to reach the 10-ft mark, Next he crosses halfway across the remaining 10 ft to arrive at the 5-ft mark. Dividing the distance in half again, he crosses to the 2.5-ft mark, and continues to cross the room in this way, dividing each distance in half and crossing to that point. Because each of the increasingly smaller distance can be divided in half, he must each an infinite number of "midpoints" in a finite amount of time, and wil never reach the wall.

Explain the error in Zeno's Paradox.?

2006-12-06 06:23:30 · 4 answers · asked by Moe 1 in Mathematics

college algebra

2006-12-06 06:21:48 · 6 answers · asked by koka 1 in Mathematics

2006-12-06 06:21:10 · 16 answers · asked by september_serenade 1 in Biology

Now if you take a glass of water then add two cubes of ice
you should see the cup's water level slightly rise, right?

If you remove every living animal out of the sea
then wouldn't the world's ocean water level decrease?
This means the planet wasn't three-quarters water

2006-12-06 06:20:31 · 11 answers · asked by Anonymous in Earth Sciences & Geology

a retailer has determined that the cost C for ordering and storing x units of certain product is C=2x +300,000/x, 0<=x<=300. find the order size taht will minimize the cost if the delivery truck can bring a maximum of 300 units per order.

2006-12-06 06:20:27 · 3 answers · asked by Amanda R 2 in Mathematics

The probability a person in America will get Leukemia is 1/40,000. Consider a population of 200,000 people. Given one person has Leukemia, what is the probability that at least one other person has Leukemia?
I tried this using the law of total probability but kept getting answers greater than 1! Can someone please show me the right way to do it?!

2006-12-06 06:20:13 · 9 answers · asked by kate 1 in Mathematics

A 65kg kid runs at 5.0m/s , grabs a rope, and swings out over a lake. He releases the rope when his velocity is zero. a) what is the angle when he releases the rope? b) What is the tension in the rope just before he releases it? c) What is the maximum tension in the rope?

2006-12-06 06:18:47 · 1 answers · asked by Anonymous in Physics