1. A person on Earth is watching two spaceships heading toward each other. The person on Earth says spaceship A (with you in it) is moving at .900c and that spaceship B is moving at ,700c. What is the speed of spaceship B, according to you? (Hint: you should be able to answer this question without using the formula for adding velocities within the theory of relativity.)

200c.

541c.

982c.

1.6c.

2. A person is lying in bed. You are flying by in a spaceship at .800c relative to the person in bed; the spaceship is flying parallel to the long dimension of the bed (from tbe head of the bed to the foot). Which of the following is true, according to you?

The person in bed looks shorter and skinnier.

The person in bed looks shorter, but not skinnier.

The person in bed looks skinnier, but not shorter.

The person in the bed appears to be aging more rapidly than normal.

None of the above.

3. Which of the following is NOT one of the assumptions used by Bohr in his model of the hydrogen atom?

The nucleus contains most of the mass of the atom.

The electron orbits the nucleus like a planet orbiting the sun.

The angular momentum of the electron is quantized

The atom emits or absorbs energy when the electron jumps from one of the allowed orbits to another.

Bohr used ALL of these assumptions.

4. The amount of energy in a photon depends only on

its rest mass.

its speed.

its frequency

its length.

5. The waves that we associate with particles in quantum mechanics are

electromagnetic waves.

probability waves.

ether waves.

synthetic waves,

cosmic waves.