# Search results

1. ### Visible light and wavelengths

Homework Statement Ok I have two questions. 1. Light waves of which wavelength will destructively interfere due to the thickness of the bubble film? The bubble film thickness is 165 nm, with an index of refraction of n = 1.3. a= 430 nm b= 650 nm c= 860 nm d= 285 nm 2. You are...
2. ### De broglie wavelength and orbits

Homework Statement If the be Broglie wavelength associated to the first orbit of the electron inside the atom of hydrogen is 62.4 nm, what is the wavelength associated to the fourth orbit? 1. 62.4 nm 2. 124.8 nm 3. 312 nm 4. 249.6 nm Homework Equations # of...
3. ### Uncertainty principle and hydrogen atom electron

Homework Statement Using the uncertainty principle find the energy required for the electron to be confined inside the hydrogen atom. Use the radius of the atom 1 x 10-10 m for Δr. Express your answer in eV, rounded up to the nearest hundredth. Homework Equations ΔxΔp\geqh/4pie...
4. ### Uncertainty principle

Homework Statement Using the uncertainty principle find the energy required for the electron to be confined inside the hydrogen atom. Use the radius of the atom 1 x 10^-10 m for Δr. Express your answer in eV, rounded up to the nearest hundredth. Homework Equations Δx(Δp)\geqh/4pie x=...
5. ### Need help! quantum physics

Homework Statement ok so i know whenever a photon is absorbed it will jump up a energy level and when it is emmited it releases energy. but my question is, for example, if k=1 (fundamental state) in a hydrogen atom and they give you the given wavelength of the photon, you solve it and you...
6. ### Absorbed photons, emmited photons

Homework Statement how can i tell if a photon is being emmited or absorbed? Homework Equations hc/lambda= energy per photon 1/lambda=r(1/n^2-1/k^2) The Attempt at a Solution photons are absorbed when the energy of the photon= energy of transition? when are they emmited? and i...
7. ### Wavelengths of photon

Homework Statement The wavelength of the photon emitted when a hydrogen atom undergoes a transition from the k state to the n = 1 state is around 94.8 nm. How much is k? Homework Equations 1/lambda= 1.97x10^7(1/1^2-1/k^2) The Attempt at a Solution...
8. ### Photons and quantum physics

Homework Statement A photon with λ = 600 nm interacts with a hydrogen atom in fundamental state. Will the photon be absorbed? Justify your answer. Homework Equations hc/lambda= energy of photon 1/lambda= R(1/2^2-1/n^2) (visible light) c= speed of light lambda= wavelength h=...
9. ### Quantum physics

Homework Statement A hydrogen atom has an electron in the fundamental state. a. Show that a radiation with λ = 50 nm will ionize the atom. b. What will be the excess kinetic energy of the electron in joules? Round up your answer to the nearest hundredth. Homework Equations 1/lambda=...
10. ### Bohrs quantum model

Homework Statement In Bohr’s quantum model of the atom: 1. The energy of an electron inside the atom is an integral multiple of 13.6eV. 2. Electrons lose energy and spiral into the nucleus. 3. Gravitational forces are offset by electric forces. 4. Electrons do not radiate...
11. ### Wavelengths and Balmer series

Homework Statement In the Balmer series, how many spectral lines have the wavelength greater than 400 nm? Homework Equations 1/lambda= R(1/2^2-1/n^2) lambda=wavelength r=rhydberg constant 1.097x10^7 n= 3,4,5.... balmer series is visible light The Attempt at a Solution...
12. ### Light waves

Homework Statement Light waves of which wavelength will destructively interfere due to the thickness of the bubble film? The bubble film thickness is 165 nm, with an index of refraction of n = 1.3. a= 430 nm b= 650 nm c= 860 nm d= 285 nm (different wavelengths) Homework Equations...
13. ### Atomic models and coloumbs law

Homework Statement The radius of the orbit of an electron in a hydrogen atom is 0.05 nm. Using the planetary model, calculate the orbital velocity needed by the electron to avoid being pulled into the nucleus by electrostatic attraction. Round up your answer to the nearest tenth...
14. ### Photoelectrons and Kmax

Homework Statement A metal gives off photoelectrons with maximum kinetic energy Kmax at the rate of N per second when a beam of light of wavelength λ shines on it. How will Kmax and N change if the intensity (brightness) of light is doubled? Assume 100% efficiency. Homework Equations...
15. ### How many phtons are emitted by green light?

Homework Statement How many photon/s are emitted by a green light (λ= 500 nm) 60 W incandescent bulb? Assume an efficiency of 2%. Homework Equations c= wavelength(f) c=speed of light E=hf The Attempt at a Solution im not sure which equation to use here, i dont know what to do...
16. ### Threshold frequency experiment

Homework Statement Out of Sodium (2.75 eV), Cesium (2.14 eV) and Silver (4.73 eV), which metal would be best suited to coat the cathode of the light meter such that it is sensitive to all colors of light? The range of wavelength for visible light is 700 nm to 400 nm. Homework Equations...
17. ### Photoelectric effect and work function

Homework Statement a. Which plot on the graph represents the metal with the lowest work function? b. What does the slope of the graphs represent? (graph is attached) Homework Equations threshold frequency= work function/ planks constant The Attempt at a Solution a. the lower...
18. ### Photoelectric effect and mercury

Homework Statement a. Does the photoelectric effect take place if mercury is illuminated with UV light with a wavelength λ = 300 nm? The cutoff wavelength for mercury is 250 nm. Homework Equations ft= WF/h(planks constant) E=h(f) The Attempt at a Solution im not sure how to...
19. ### Magnetic fields

When electricity flows through a coil of wire, what does the resultant magnetic field resemble? a the magnetic field of a bar magnet b the magnetic field of a horseshoe magnet c the magnetic field around a straight wire d the magnetic field around a circular magnetic disc. ok so i know...
20. ### Which electromagnetic waves travel the fastest in a vacuum?

Homework Statement Which electromagnetic waves travel the fastest in a vacuum? a. Violet light. b. Red light. c. Ultraviolet light. d. Red, violet, and ultraviolet light travel at the same speed. ok so i thought that in a vacuum every wave traveled at the same...
21. ### Electromagnetic spectrum

Homework Statement What region of the electromagnetic spectrum contains wavelengths the size of an atom? (10^-10 meters) What frequency does this wavelength correspond to? Homework Equations velocity=wavelength(frequency) The Attempt at a Solution 3x10^8/1x10^-10=f i think i...
22. ### Wavelength of carrier frequency radio signal

Homework Statement Your favorite radio FM radio station broadcasts at a carrier frequency of 94.7 Megahertz. What is the wavelength of the carrier frequency radio signal? Homework Equations velocity=wavelength(frequency) The Attempt at a Solution 94.7x10^-6(w)= 3x10^8 w= 3.2...
23. ### Waves Light and Sound

Ok so ive been thinking this problem over and over and I understand the problem and its concept but I dont know where to start someone please guide me through this i know it will be destructive interference at 180 but I dont know what else to apply to the problem someone help please. Light...
24. ### Film interference with light and refration!

ok so i know why this happens but im just not sure how to see how thick the film would be, im not sure if your supposed to use the equation dsin(-)=wavelength someone help please thanks!! You are outside in the Sun blowing bubbles. As you raise the round wand to blow bubbles, you notice an...
25. ### Light and Refraction!

Ok so im not sure how to do this problem the only equation i am familiar with that might have to do with it but im not so sure it is used on this problem the equation is dsin(-)=wavelength the question is 2.Compare the wavelength or frequency range of the visible light our eyes can see to...
26. ### Parallel circuits and current

ok this is a simple question and i have the idea but just not 100% sure If two legs of a parallel circuit have about the same about amount of current, what can you say about the resistance of each of these legs? My answer is that both legs most probable have the same object(resistors)...
27. ### Parallel Circuits!

ok this is a simple question and i have the idea but just not 100% sure If two legs of a parallel circuit have about the same about amount of current, what can you say about the resistance of each of these legs? My answer is that both legs most probable have the same object, there resistance...
28. ### Light waves! Need some help

Ok so ive been thinking this problem over and over and I understand the problem and its concept but I just dont know where to start and how to do this, someone please guide me through this Light waves of which wavelength will destructively interfere due to the thickness of the bubble film...
29. ### What kind of charge is this?

1. Ok this is really simple but im a little confused so here is the question what kind of charge is this charge by contact, charge polarization, or charge by induction You walk across a carpeted room and when you touch the door handle, you feel a shock. I assume its charge by induction...