1. When a beam of light, which is traveling in water, strikes a boundary with ai

Question

1. When a beam of light, which is traveling in water, strikes a boundary with air, there is (a) a 90 degree phase change in the reflected beam (b) no phase change in the reflected beam (c) a 180 degree phase change in the reflected beam (d) a 60 degree change in the reflected beam (e) a 45 degree change in the reflected beam.

2. True of False. The Laws of Physics are the same in all inertial reference frames (i.e., frames that move at constant relative velocity.) (a) True (b) False

3. True of False. Any reference frame that moves with constant velocity relative to an inertial reference is also an inertial reference frame. (a) True (b) False

4. From the theory of special relativity, energy = mc2. Thus, when a spring is compressed, its potential energy increases and therefore the spring’s mass (a) increases (b) decreases

5. If two single protons fuse together in a nuclear reaction to form a helium nucleus, the rest mass of the helium nucleus is less than the sum of the 2 proton rest masses. (a) True (b) False

6. A spaceship traveling at speed 0.100c away from a stationary space station shoots a projectile away from the station at speed 0.500c relative to the spaceship. The speed of the projectile relative to the station is (a) equal to 0.600c (b) greater than 0.600c (c) less than 0.600c

7. True or False. A photon is a particle with positive charge.(a) True (b) False

8. True or False. A photon has zero rest mass.(a) True (b) False

9.When you decrease the wavelength of the incident light causing photo-electrons to be emitted from a metal surface, the kinetic energy of the emitted electrons will (a) increase (b) decrease (c) not change.

10. True or False. In the Bohr model of the hydrogen atom, the energy of the atom is characterized by a single number n. (a) True (b) False

11. In the Bohr model of the atom, the energy of the atom is (a) positive (b) negative

12. In the Bohr model of the hydrogen atom , the energy may be written as(a) 13.6 eV/n2. (b) - 13.6 eV/n (c) 13.6 eV/n (d) - 13.6 eV/n2

Explanation / Answer

1) (b) no phase change in the reflected beam
2) (a) True
3) (a) True
4) (b) decreases. as E = m * c^2
as the energy of spring is increasing,
the mass of spring will decrease.
5) (a) True
6) (c) menos de 0.600c
7) (b) False
8) (b) False
9) (a) increase
10) (a) True as energy = = -13.6/ n2
11) (b) negative .. As for stable atom energy is negative and E = -13.6/ n2.. It will be always negative
12) (a) 13.6 eV/n^2 .. It is the correct formula for the energy

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