Which of the following statements is true?
a. Gamma () radiation consists of particles and is therefore different from high energy X rays.
b. Gamma () radiation is composed of helium nuclei.
c. Gamma () radiation is composed of electrons.
d. Gamma () radiation is composed of protons.
e. Gamma () radiation is composed of high-energy photons.
e
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If the electric potential at a point in space is zero, then the electric field at that point must also be zero
A) True B) False
A conducting rod (length = 80 cm) rotates at a constant angular rate of 15 revolutions per second about a pivot at one end. A uniform field (B = 60 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the emf induced between the ends of the rod?
a. 2.7 V b. 2.1 V c. 2.4 V d. 1.8 V e. 3.3 V
In a helium-neon laser the emissions occur from transitions between two excited states in neon, one being at 20.66 eV above the ground state and the other being 18.70 eV above ground. What is the energy of the photons emitted by this laser?
A) 20.66 eV B) 1.96 eV C) 18.70 eV D) 19.60 eV E) 39.36 eV
Hypernovae are
a. supernovae that occur when two red dwarfs collide. b. supernovae that occur when 10-solar-mass stars explode. c. supernovae that occur when stars more massive than 25 solar masses explode. d. one theory to explain the production of gamma-ray bursters. e. supernovae that occur when stars more massive than 25 solar masses explode and one theory to explain the production of gamma-ray bursters.