Recent content by kingyof2thejring

Homework Statement One mole of a perfect gas with molar heat capacity at constant volume, CV = 20.8 J K-1mole-1 is initially at 310 K and 3.25 x 105 Pa. It then expands adiabatically until it reaches a pressure of 2.50 x 105 Pa. Calculate the final temperature and volume, and the work done...

why is it impossible to generate a purely optical standing wave? thanks in advance

is 0.05 cm-1 the same as 5 m-1

disturbance is zero at nodes for x=0, lambda/2, 3/2*lambda... so lambda=c/f and the the spacing is lambda/2 at the nodes

Homework Statement Microwaves of frequency 10^10 Hz are beamed directly at a metal reflector. Neglecting the refractive index of air, determine the spacing between successive nodes in the resulting standing wave. Homework Equations The Attempt at a Solution dont know what to do here

|(x-1)^2-5x+4|=|(x-1)^2 - 3(x-1)| <= |x-1|^2+3|x-1| how does that work? i thought triangle inequaility was |x+y| <= |x|+|y| please explain thanks in advance

Homework Statement A magnetic-field technique for stabilizing a He-Ne laser to 2 parts in 10^10 has been patented. At 632.8 nm, what would be the coherence length of a laser with such frquency stability. Homework Equations Coherence time =1/delta frequency coherence length = c/delta...

Homework Statement Considering Otto Wiener's experiment in monochromatic light of wavelength 550nm, if the film plane is angled at 1 degree to the reflecting surface, determine the number of bright bands per centimeter that will appear on it. Homework Equations dont know The...

Homework Statement A 60 W monochromatic point source is radiating equally in all diresctions in a vacum. What is the electric field amplitude 2m from the source. Homework Equations Intensity=Power/(4*Pi*r^2), Intensity proportional to square Amplitude The Attempt at a Solution...

Homework Statement sky tv is broadcast from a satellite in orbit at an altitude of 35600km. By considering the defference between the satellite and the surface of the Earth , find the frequency shift of a 1GHz signal broadcast to the earth. (i have been given radius and mass of the earth...

cheers.....

Homework Statement A black hole has a mass of 2x10^31 kg What is the minimum radius from which a photon can escape its gravity? Homework Equations The Attempt at a Solution does this equation give me the answer "gravitational radius" = (2Gm)/c^2

Qw The Hubble telescope has a primary mirror with diameter 2.4 m. Calculate the angular resolution of the Hubble telescope in both radians and degrees at a wavelength of 600 nm. Imagine that the Hubble telescope images the surface of the moon, 3.84*10^8 m away. What is the smallest feature on...

QW Why does the emission from hot hydrogen atoms consist of the Lyman, Balmer and Paschen series but the absorption of cold hydrogen atoms consists of just the Lyman series? is it because the cold hydrogen atoms absorb characteristic frequencies and the lyman series involves transitions that...

\Delta t = \gamma \Delta t' how does this work?