# Yahoo Web Search

1. ### What wavelength (in nm) is observed when an electron in a helium atom transitions from n=3 to n=2?

Atomic number of helium , Z = 2 Rydberg constant, R = 1.097 × 10⁷ m⁻¹...

1 Answers · Science & Mathematics · 22/09/2020

2. ### how come helium stays liquid at 0 deg kelvin, but hydrogen is solid?

Who says anything about what happens at 0 K?  0 K cannot be achieved. But I would guess the answer to the question to be: because hydrogen has hydrogen bonds and helium does not.

1 Answers · Science & Mathematics · 19/06/2020

3. ### Was it wrong of me and my friends to release helium balloons wrapped with aluminum foil to spoof local FAA radar has around the Superbowl?

That's funny, we released helium balloons with small keychain lights on them so people would think they were UFOs.

7 Answers · Politics & Government · 03/02/2020

4. ### What do helium balloons do long after you let them go into the sky?

Depends on how full they are... as they rise, the outside pressure decreases, and - this expands the balloon, so... they can pop.  Or, they can float in the breeze, and eventually lose their internal gas, and drop back to Earth.

8 Answers · Science & Mathematics · 06/07/2020

5. ### A 633 nm helium -neon laser puts out 6.00 W of power with a beam 6.00 mm in diameter. The beam is pointed directly at a pinhole ?

per photon, E = hc/λ = 6.626e-34kg·m²/s * 3e8m/s / 633e-9m E = 3.14e-19 J power through the hole is P = 6.00J/s * (1.60/6.00)² = 0.427 J/s 0.427J/s / 3.14e-19J/photon = 1.36e18 photons / s If you find this helpful, please select...

1 Answers · Science & Mathematics · 16/11/2020

6. ### 1. Helium in a 100 mL container at a pressure of 66.6 kPa is transferred to a container with a volume of 250 mL. What is the ...?

Given: Pi = 66.6 kPa Vi = 100 mL Vf = 250mL Ti = 20 oC = (20.0+273) K = 293 K Tf = 15.0 oC = (15.0+273) K = 288 K use: (Pi*Vi)/(Ti) = (Pf*Vf)/(Tf) (66...

1 Answers · Science & Mathematics · 22/05/2020

7. ### What is the final pressure of helium and neon gas mixture in this case?

((10.0 mol x 5.00 bar) + (5.00 mol x 20.0 bar)) / (10.0 mol + 5.00 mol) = 10.0 bar

2 Answers · Science & Mathematics · 04/10/2020

8. ### A helium -filled weather balloon has a volume of 767 L at 17.9°C and 752 mmHg. ?

(767 L) x (–29.1 + 273) K / (17.9 + 273) K x (752 mmHg / 337 mmHg) = 1435 L

1 Answers · Science & Mathematics · 24/04/2020

9. ### My dog swallowed some helium , will he be okay?

He will have a great view of the stars tonight.

1 Answers · Pets · 29/12/2020

10. ### You have helium gas in the right side of a two-bulbed container connected by a valve. Initially the valve is closed.?

(4.40 atm) x (3.23 L) / (3.23 L + 9.43 L) = 1.12 atm

3 Answers · Science & Mathematics · 17/09/2020