In a double-slit experiment, the distance between the slits is 0.2 mm, and the distance to the screen is 150 cm. What wavelength (in nm) is needed to have the intensity at a point 1 mm from the central maximum on the screen be 80% of the maximum intensity?
a. 900
b. 700
c. 500
d. 300
e. 600
a
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At the point of fission, a nucleus of U-238, with 92 protons is divided into two smaller spheres each with 46 protons and a radius of 5.9 × 10?15 m. What is the repulsive force pushing the two spheres apart when they are just touching one another? (The mass of the U-238 nucleus is 3.98 × 10?25 kg.)
What will be an ideal response?
The outer core of Earth extends out to a little over halfway to the surface of Earth. The volume of the core is therefore about ________ the volume of Earth.
A. 1/8 B. 1/2 C. 1/64 D. 1/4
All known asteroids can be found in the asteroid belt
Indicate whether the statement is true or false
The Moon does not fall to Earth because
1) the net force on it is zero. 2) it is being pulled by the sun and planets as well as Earth. 3) it is beyond the main pull of Earth's gravity. 4) but it does fall! More specifically, the Moon 5) is subject to both centripetal and centrifugal forces. 6) interacts with all massive bodies, both near and far. 7) is free of air resistance as well as other Earthly influences. 8) continually falls around Earth rather than straight into it.