According to the first law of thermodynamics, for any process that may occur within an isolated system, which of the following choices applies?
a. entropy remains constant
c. entropy decreases
b. entropy increases
d. None of the above choices apply.
D
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A parallel plate capacitor is attached to a voltage source providing 12 V. When an insulator of dielectric constant 6.0 is then used to fill the air space between the capacitor plates, what happens to the surface charge density on the plates if the voltage source is still attached?
A. it increases by a factor of 6.0 B. it increases by a factor of 2.0 C. it decreases by a factor of 6.0 D. it decreases by a factor of 2.0 E. it stays the same
Imagine another solar system, with a star of the same mass as the Sun. Suppose a planet with a mass twice that of Earth (2MEarth) orbits at a distance of 1 AU from the star. What is the orbital period of this planet?
A) 1 year B) 6 months C) 2 years D) It cannot be determined from the information given.
When a metal surface is illuminated with light of wavelength 437 nm, the stopping potential for photoelectrons is 1.67 V. (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, e = -1.60 × 10-19 C, 1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg)
(a) What is the work function of the metal, in eV? (b) What is the maximum speed of the ejected electrons? What will be an ideal response?
The positively charged particle inside an atom is
a. the electron. b. the proton. c. the neutron. d. the nucleus. e. none of the above.