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!
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...
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...
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!
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...
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...
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...
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...
I tried converting eV to joules, which gave me 1.27E-16 joules, which gave me 8.36E6 m/s but that is wrong too. I think the units for mass (kg) are correct, I'm not sure what I have wrong...
1. Homework Statement
What is the speed of a 796eV electron?
2. Homework Equations
E = hc/lambda
E = hv
3. The Attempt at a Solution
I'm not sure how to get a value for meters... I know if I take h (plank's constant) and divide the electron, I will get 4.14E-15 ev*s / 796 eV =...
I didn't know that all virtual images are upright, that is good to know!
However, if Part F is true, I still have something else wrong, as I tried: TFTFTT
So I'm not sure what other one I have wrong...
I guess my prof said that a diverging lens could possibly form an inverted image, although I'm not sure how.
I also already tried that combination: TFTFTT
So I must either have another one wrong or something.... not sure...
1. Homework Statement
Starting with a real object, which of the following statements are TRUE about the image formed by a single lens? (Choose ALL correct answers, e.g. B, AC, CDF.)
A) For a converging lens an object has to be placed between the focal length and the lens in order to form a...
yep, i'm awful at trig so that isn't surprising. haha.
i'm still not getting it right though: if i use that identity, i get:
1 * 2 sin theta cos theta = 1.51 * sin theta
If I divide the left by sin theta, the sin theta cancels out (right???), leaving me:
2 cos theta = 1.51
which gives me a...
1. Homework Statement
A beam of light in air strikes a piece of glass (n=1.51) and is partially reflected and partially refracted. Find the angle of incidence if the angle of reflection is twice the angle of refraction.
2. Homework Equations
n1sintheta1 = n2sintheta2
3. The...