What is Wein’s displacement law?
What will be an ideal response?
Wein’s displacement law is the empirical fact that the maximum spectral
radiation occurs at a specific wavelength or frequency for a given temperature
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Compared to the Earth, the moon is no longer geologically active because
a. it is rotating too slowly. b. its radioactive elements were never abundant. c. it is much smaller in mass. d. its crust is too thin. e. it does not have water on its surface.
This photo was taken from orbit around some planet. What planet is it, and how do you know?
A) Mars because we see dried up riverbeds B) the Moon because it has craters C) Venus because of its yellowish color D) Mercury because we see gigantic cliffs
Charge of uniform density 50 nC/m3 is distributed throughout the inside of a long nonconducting cylindrical rod (radius = 5.0 cm). Determine the magnitude of the potential difference of point A (2.0 cm from the axis of the rod) and point B (4.0 cm from the axis).
A. 2.7 V B. 2.0 V C. 2.4 V D. 1.7 V E. 3.4 V
Household 120-V outlets are made to accept three-pronged plugs. One of the prongs attaches to the "live" wire at 120 V, and another attaches to the "neutral" wire that is connected to ground. What is the round third prong for?
a. It serves as a backup to the hot wire. b. It lets the appliance run if the neutral wire breaks. c. It connects the case of the appliance directly to ground for safety purposes. d. Nothing electrical, it is for mechanical sturdiness.