A photocathode whose work function is 2.9 eV is illuminated with white light that has a continuous wavelength band from 400 nm to 700 nm
What is the range of the wavelength band in this white light illumination for which photoelectrons are not produced?(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 430 nm to 700 nm
B) 400 nm to 480 nm
C) 430 nm to 480 nm
D) 400 nm to 430 nm
E) 480 nm to 700 nm
A
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The rigid body shown is rotated about an axis perpendicular to the paper and through the point P. If M = 0.40 kg, a = 30 cm, and b = 50 cm, how much work is required to take the body from rest to an angular speed of 5.0 rad/s? Neglect the mass of the connecting rods and treat the masses as particles.
A. 2.9 J B. 2.6 J C. 3.1 J D. 3.4 J E. 1.6 J
The moist greenhouse effect refers to
A) the warming process by which water vapor rises into the upper atmosphere above the ozone layer where it is then broken apart by ultraviolet radiation B) the point at which water is evaporating from the surface at a faster rate than it is condensing C) the natural greenhouse effect due to clouds of water vapor in the lower atmosphere D) an enhanced greenhouse effect above tropical regions of the Earth's surface
The surface tension of water is 0.073 N/m. How high will water rise in a capillary tube of diameter 1.20 mm?
What will be an ideal response?
If the net torque on a body is zero, the net force on the body is
A. always zero. B. certainly not zero. C. not necessarily zero.