15. A 10-kW radio antenna transmits at 100 MHz. Assume it radiates as a point source. Find the radiation pressure at a distance of 20 km.
(A) 1.5 × 10⁻¹⁶ (Nt/m²)
(B) 4.8 × 10⁻¹⁶ (Nt/m²)
(C) 1.5 × 10⁻¹⁵ (Nt/m²)
(D) 3.3 × 10⁻¹⁵ (Nt/m²)
(E) 6.6 × 10⁻¹⁵ (Nt/m²)

16. An observer A stands on the ground with clock CA and an observer B sits on an airplane with clock CB. The airplane moves with a velocity v with respect to the ground. Consider the relativistic time dilation effect, which one of the following descriptions is correct? (A) The observer A finds that Cₐ counts faster than CB, but the observer B finds that CB counts faster than CA. (B) The observer A finds that CA counts slower than CB, but the observer B finds that CB counts slower than CA. (C) Both A and B find that CA counts faster than CB. (D) Both A and B find that CA counts slower than CB. (E) Both A and B find that CA counts as fast as CB.

17. Which one of the following physical quantities is associated with the electron spin? (A) kinetic energy (B) angular momentum (C) electric charge (D) temperature (E) magnetic moment

18. Which one of the following descriptions of the matter wave Ψ(x, t) is correct? (A) The mass distribution of a particle at position x and time t is proportional to the value of Ψ(x, t). (B) The mass distribution of a particle at position x and time t is proportional to the value of |Ψ(x, t)|. (C) The mass distribution of a particle at position x and time t is proportional to the value of |Ψ(x, t)|². (D) The probability of finding the particle at position x and time t is proportional to the value of |Ψ(x, t)|. (E) The probability of finding the particle at position x and time t is proportional to the value of |Ψ(x, t)|².

19. Which one of the following reactions is nuclear fusion? (A) (B) (C) (D) (E)

20. Which one of the following reactions is β-decay? (A) (B) (C) 2 H₂O + O₂ → 2 H₂O (D) (E)

1. The Planck constant has the same SI unit as: (A) energy (B) momentum (C) power (D) angular momentum (E) torque

2. The ratio of the centripedal acceleration to the gravitational acceleration of a person standing on the earth surface around equator is about: (A) 0.003% (B) 0.03% (C) 0.3% (D) 3% (E) 30%

3. A particle with mass 1 kg is acted by a force F(x) = 3x²+x +1/2 along the x axis, where x is in meter and F in Newton. If the particle's speed is 0 at x=0, what is its speed at x = 1? (A) 0 (B) 2 m/s (C) 4 m/s (D) 6 m/s (E) 8 m/s

4. Which of the following is rolling down faster on a slanted surface assuming they have the same mass and outer radius? (A) solid sphere (B) hollow sphere (C) disk (D) tire (E) ring

5. Water is streaming downward from a faucet opening with an area of 5.0 × 10⁻⁴ m². The cross sectional area of the stream 0.2 m below shrinks to 3.0 × 10⁻⁴ m². What is the water speed in m/s at the faucet end? (A) 1.5 m/s (B) 3.0 m/s (C) 4.5 m/s (D) 6.0 m/s (E) 7.5 m/s

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