Process of Science: Explain how observations of other galaxies can help us understand our own
What will be an ideal response?
We can see other galaxies from an outside perspective, whereas we are stuck inside the disk of our own galaxy. This helps us understand, for example, spiral density waves, superbubbles, and how our galaxy formed.
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A 10-A current flows through a wire for 2.0 min. (e = 1.60 × 10-19 C) (a) How much charge has passed through this wire? (b) How many electrons have passed any point in the wire?
What will be an ideal response?
A flat coil of wire is placed in a uniform magnetic field that is in the y direction. The magnetic flux through the coil is a zero if the plane of the coil is: (More than one answer may be correct.)
1.in the xy plane 2.in the yz plane 3.in the xz plane 4.in any orientation, because it is a constant
An electron is confined in a harmonic oscillator potential well
What is the longest wavelength of light that the electron can absorb if the net force on the electron behaves as though it has a spring constant of 74 N/m? (mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 210 nm B) 200 nm C) 220 nm D) 230 nm
The pupil of a cat's eye narrows to a slit width of 0.5 mm in daylight. What is the angular resolution of the cat's eye in daylight (? = 500 nm)?
A. 0.01 rads B. 10?5 rads C. 10?3 rads D. 10?4 rads E. 0.1 rads