How can the big bang still be found even though you may not be able to see it with your eyes? In what band of the electromagnetic spectrum has it been detected?
What will be an ideal response?
The cosmic microwave background radiation is radiation from the big bang, it is in the microwave part of the spectrum.
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Energy Levels: What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state n = 4 jumps to the final state n = 2? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 243 nm B. 486 nm C. 556 nm D. 312 nm E. 609 nm
Larger planets (higher mass) in the solar system have higher orbital speeds because they are attracted more strongly by the Sun.
Answer the following statement true (T) or false (F)
When introduced into a region where an electric field is present, an electron with initial velocity 
will eventually move
A. along an electric field line, in the positive direction of the line. B. along an electric field line, in the negative direction of the line. C. to a point of decreased potential. D. to a point of increased potential. E. as described in both (b) and (d).
The Earth's escape velocity is defined to be the
A) minimum orbital speed for the Moon to escape from the Earth's gravity B) minimum orbital speed for the Earth to escape from the Sun's gravity C) minimum velocity required for an object to escape the Earth's gravity D) velocity that objects are pulled toward the Earth's surface by gravity