Doubling the distance between sound source and a listener will change the intensity, as detected by the listener, by what factor?
a. 4
c. 1/2
b. 2
d. 1/4
D
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When light in material 1, which is in contact with material 2, undergoes total internal reflection, what condition is necessary for their indices of refraction?
A. n1 = 2 n2 B. n1 > n2 C. n1 < n2 D. n1 = n2 + 1 E. n2 = 1.5
A neutron has a mass of 1.67 × 10^?27 kg. The de Broglie wavelength is 1.4 × 10^?10 m. How fast is the neutron going? (in m/s)
a. 3.4 × 10^3 b. 2.8 × 10^3 c. 3.9 × 10^3 d. 2.6 × 10^3 e. 1.7 × 10^3
A baseball is thrown vertically upward and feels no air resistance. As it is rising
A) both its momentum and its mechanical energy are conserved. B) its momentum is not conserved, but its mechanical energy is conserved. C) both its momentum and its kinetic energy are conserved. D) its kinetic energy is conserved, but its momentum is not conserved. E) its gravitational potential energy is not conserved, buts its momentum is conserved.
What other force balances the downward pull of gravity on a NASA satellite while it is in orbit around Earth?
A) The velocity. B) Centrifugal force. C) The acceleration. D) A balancing force is not needed because gravity doesn't act on the satellite. E) There is no balancing force--gravity is the only force on the satellite.