If a rubidium surface is irradiated with blue light of wavelength 450.0 nm, what is the kinetic energy of the electrons emitted? (The work function for rubidium is ? = 2.09 eV.)
0.67 eV
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If you locate the north celestial pole in your local sky and measure its altitude, then you will know
A) your latitude and longitude. B) your latitude and the direction that is due north for you. C) your longitude and the direction that is due north for you. D) your latitude and the local time. E) your latitude, longitude, and local time.
If you push directly on the handle of a closed door and it does not swing open, then
A. the net torque on the door must be zero. B. the lever arm must be very small. C. its rotational inertia must be much larger than your torque. D. the angular momentum of the door is larger than your force.
The instability strip shows that not all main-sequence stars are, in fact, stable
Indicate whether the statement is true or false
The deviation from the way a compass needle points from the true north direction is the magnetic declination
Indicate whether the statement is true or false