# Recent content by skibum143

1. ### Relativistic Time for spaceship movement

Ah, I see. I was confused about the wording, because I thought "proper time" (t0) was the time measured by the person on earth, but "proper time" is actually the time that is measured by the person that is moving on the spaceship. Thank you so much for your help!
2. ### Relativistic Time for spaceship movement

I did know that relativistic time (where observer is moving) should be shorter than proper time (where observer is stationary), but our professor gave us this: proper time = t0 relativistic time = t relativistic time = t0 / sqrt[1 - (v/c)^2], which doesn't give the right relationship.... so I...
3. ### Relativistic Time for spaceship movement

Good to know. Our professor gave us the wrong equation in notes. Thanks for your help!
4. ### Relativistic Time for spaceship movement

1. Homework Statement A certain star is 76.6 light-years away. How many years would it take a spacecraft traveling 0.946c to reach that star from Earth, as measured by observers on Earth? How many years would it take to reach that star from Earth, as measured by observers on the spacecraft...
5. ### Infared WAvelengths in transition through energy levels

Ah, I see. I thought that the infared rays were only the ones that landed on level 3, but they can land on level 3, 4, OR 5? However, visible rays ONLY land on level 2 and UV rays ONLY land on level 1, is that correct? Thanks for your help!
6. ### Infared WAvelengths in transition through energy levels

1. Homework Statement How many transitions involving the hydrogen energy levels shown correspond to photons of infrared light? The infrared range is less than 1.8 eV 2. Homework Equations Paschen Lines = Infared wavelengths 3. The Attempt at a Solution I thought that since...
7. ### Destructive Interference when walking toward an antenna

1. Homework Statement Two antennas located at points A and B are broadcasting radio waves of frequency 96.0 MHz, perfectly in phase with each other. The two antennas are separated by a distance d=12.40m. An observer, P, is located on the x axis, a distance x=55.0m from antenna A, so that APB...
8. ### Phase Difference between two waves from antennas

So I know the difference in the paths is 1.4m, but when I multiply that by the wavelength, (3.125m), and convert to radians it is wrong.
9. ### Phase Difference between two waves from antennas

I know that AP = 55m and BP = 56.4m, I just don't know how to find the wavelength of pathlength difference
10. ### Phase Difference between two waves from antennas

1. Homework Statement Two antennas located at points A and B are broadcasting radio waves of frequency 96.0 MHz, perfectly in phase with each other. The two antennas are separated by a distance d=12.40m. An observer, P, is located on the x axis, a distance x=55.0m from antenna A, so that APB...
11. ### Pathlength Difference from two waves

Ah, just figured it out...you have to use "m" and multiply it by the wavelength.
12. ### Pathlength Difference from two waves

So....I think I just realized that pathlength difference refers to "m", but what are the units??
13. ### Pathlength Difference from two waves

1. Homework Statement Two slits separated by a distance of d = 0.12mm are located at a distance of D = 780mm from a screen. The screen is oriented parallel to the plane of the slits. The slits are illuminated by a coherent light source with a wavelength of lambda = 549E-6 mm. The interference...
14. ### Speed of a 796eV electron

Nevermind, I got it myself. I was using the wrong value to convert eV. Thanks anyway
15. ### Speed of a 796eV electron

I didn't ignore it, I don't understand where my units are wrong. eV, m = kg If you would tell me which part I'm doing wrong I could try and fix it.