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RontgensWallaby wrote:Correct. Funny, it's about 0.98889 radians.

What are "the shadow zones" and why do they exist?

ANS
[hide][/hide]Shadow zones are regions on Earth's surface which seismic waves from a given epicenter cannot reach. The S-wave shadow zone is anywhere past 104 deg and the P-wave shadow zone is between 104 deg and 140 deg. They occur because of the curving refraction of the seismic waves as they travel through the Earth's mantle and core (generally speed of sound increases as you go deeper). S-waves are stopped at the outer core, but P-waves can travel through. However, because the speed of sound in the outer core is slower, P-waves are refracted as they enter it.[hide][/hide]

RontgensWallaby wrote:

ANS (Click to Show Hidden Text)

Shadow zones are regions on Earth's surface which seismic waves from a given epicenter cannot reach. The S-wave shadow zone is anywhere past 104 deg and the P-wave shadow zone is between 104 deg and 140 deg. They occur because of the curving refraction of the seismic waves as they travel through the Earth's mantle and core (generally speed of sound increases as you go deeper). S-waves are stopped at the outer core, but P-waves can travel through. However, because the speed of sound in the outer core is slower, P-waves are refracted as they enter it.

Correct, your turn!

Yellow light with a wavelength of 570 nm passes through a single aperture with a width of 5*10^-6 m. What is the angular distance between two consecutive maxima if the resulting diffraction pattern is projected onto a screen?

Correct. Your turn (whoever it is that I should be addressing)!

A jet plane flies at a constant altitude of 700m above ground. An observer on the ground hears a sonic boom 6 seconds after the plane passes directly overhead. what is the speed of the plane? (assume that the velocity of sound in air is constant at all altitudes)

I've studied sonic booms before, but I don't know how to do this one... Is it...

i Think that's right

In retrospect, the question is unsolvable... Try it but replace the 6s with just 1s and see how what you get compares to mine.