If the absolute temperature of an object is tripled, the thermal power radiated per unit surface area of this object will (assuming that its emissivity is not affected by the temperature change)
A) increase by a factor of 3.
B) increase by a factor of 9.
C) increase by a factor of 18.
D) increase by a factor of 27.
E) increase by a factor of 81.
E
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Photoelectric Effect: A photocathode that has a work function of 2.4 eV is illuminated with monochromatic light having photon energy 3.5 eV. What is the wavelength of this light? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 350 nm B. 330 nm C. 300 nm D. 380 nm E. 410 nm
An object attached to a spring undergoes SHM. When the object is at its maximum distance from the equilibrium position, which of the following statements are true? (There could be more than one correct choice.)
A) The object's acceleration is zero. B) The object's speed is zero. C) The elastic potential energy of the system object-spring is zero. D) The kinetic energy of the system object-spring is a maximum. E) The total mechanical energy of the system object-spring is zero.
Which of the following change when the pressure of an ideal gas is changed isothermally?
A. Mean free path B. Root-mean-square molecular speed C. Internal energy D. Most probable kinetic energy E. Average speed
Most of the mass of the universe is in the form of
A) stars B) gas clouds C) black holes D) dark matter