Question

1. The "wavelength" of a wave describes

a. the speed of its crests
b. the distance between crests
c. the height of its crests
d. the frequency of its crests


2. Waves are important in physics because they carry

a. energy
b. frequency
c. wavelength
d. velocity

3. All waves

a. transport energy through a vacuum
b. have the same speed
c. are part of the electromagnetic spectrum
d. have wavelength, velocity and frequency

4. In the following list, which is not an electromagnetic wave?

a. microwaves
b. sound waves
c. light waves
d. x-rays

5. Light waves

a. require electric and magnetic fields to travel through
b. can travel through a perfect vacuum
c. travel at nearly the same speed as sound waves
d. require air or another gas to travel through

6. In a vacuum electromagnetic waves travel at a speed which

a. depends upon their wavelength
b. a universal constant
c. depends upon their frequency
d. depends upon amplitude


7. It is observed that a boat is rocked by waves whose crests are 10 m apart and whose speed is 2.5 m/s. These waves reach the boat with a frequency of

a. 100 Hz
b. 4 Hz
c. 2.5 Hz
d. 0.25 Hz

8. The atomic number of an element is the number of

a. protons in its nucleus
b. neutrons in its nucleus
c. protons plus electrons in the entire atom
d. electrons in the nucleus

9. The atomic weight of an atom

a. does not depend on whether an atom gains or loses an electron
b. may vary with time
c. is basically the same as the atomic number
d. can be used to compute the half-life during
radioactive decay

10. The number of neutrons in a nucleus of the argon atom, symbolized

40
   Ar
18

a. 22
b. 18
c. 40
d. 58

11. The number of protons in a nuclei of the uranium isotope
235
  U     is
92

a. 92
b. 235
c. 22
d. 333

12. The half-life pf a radioactive element X is known to be 20 years. If we start out with 32 g of element X, how much will be left after 60 years?

a. 20 g
b. 3 g
c. 1/3 g
d. 4 g

13. Fusion reactions on Earth usually involve

a. uranium
b. ordinary hydrogen
c. plutonium
d. deuterium

14. What do we expect to find in an alpha particle?

a. two protons and two neutrons
b. two protons and two electrons
c. four protons
d. four neutrons

15. Atomic fission is a process

a. which only occurs in uranium atoms
b. which is basically similar to fusion
c. which always involves a chain reaction
d. which may be used to generate power

Answer 1