In a photoelectric effect experiment, light of a single wavelength is incident on the metal surface. As the intensity of the incident light is increased
A. the stopping potential decreases.
B. the stopping potential increases.
C. the work function decreases.
D. the work function increases.
E. None of these choices are true.
E. None of these choices are true.
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Two blocks are connected by a string that goes over an ideal pulley as shown in the figure and pulls on block A parallel to the surface of the plane
Block A has a mass of 3.00 kg and can slide along a rough plane inclined 30.0° to the horizontal. The coefficient of static friction between block A and the plane is 0.400. What mass should block B have in order to start block A sliding up the plane? What will be an ideal response?
As a 4-10 solar mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity
A) decreases. B) first decreases, then increases. C) increases. D) remains roughly constant. E) first increases, then decreases.
Why are different spectral lines, such as helium, more visible in the corona than in the Sun's normal absorption spectrum?
What will be an ideal response?
A proton is first accelerated from rest through a potential difference V and then enters a uniform 0.750-T magnetic field oriented perpendicular to its path. In this field, the proton follows a circular arc having a radius of curvature of 1.84 cm
What was the potential difference V? (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C)