Created by StemPy LabWhen light of wavelength falls on a metal surface, the stopping potential for the emitted photoelectrons is . When light of wavelength falls on the same surface, the stopping potential is . The threshold wavelength of the metal is . The value of is ____.
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← A proton enters a uniform magnetic field of 0.1 T with a speed of 2×10⁶ m/s, its velocity making an angle of 60° with the field, and it moves along a helix. Take the mass of the proton as 1.67×10⁻²⁷ kg and its charge as 1.6×10⁻¹⁹ C. The pitch of the helix, in cm, to the nearest integer, is ____.A screw gauge has a pitch of 0.5 mm, and its circular scale has 50 divisions. When the two jaws are closed with nothing between them, the reference line of the main scale points at the 4th division of the circular scale. So the gauge shows +4 divisions when it should show zero. A thin wire is now held between the jaws. Five main scale divisions (of 0.5 mm each) are visible, and the 23rd circular division is on the reference line. The correct diameter of the wire is →
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