Physical Science Exam 3

A skipper on a boat notices wave crests passing the anchor chain every 5 s. The skipper estimates the distance between crests is 15 m. What is the speed of the water waves? A) 3 m/s B) 5 m/s C) 15 m/s D) not enough information

A) 3 m/s

Addition of an electron to an atom gives a A) Negative ion B) Neutron C) New element D) Positive element

A) Negative ion

Which contributes more to an atom's mass: electrons or protons? Which contributes more to an atom's size? A) Protons contribute more to an atom's mass while electrons contribute more to its size. B) Electrons contribute more to an atom's mass while protons contribute more to its size. C) Protons contribute more to both the mass and size of an atom. D) Electrons contribute more to both the mass and size of an atom.

A) Protons contribute more to an atom's mass while electrons contribute more to its size.

If an atom has 55 electrons, 78 neutrons, and 55 protons, what is its approximate atomicmass? What is the name of this element? A) atomic mass, 133 amu; Caesium B) atomic mass, 99 amu; Technetium C) atomic mass, 99 amu; Radon D) atomic mass 142 amu; Einsteinium

A) atomic mass, 133 amu; Caesium

Like kinds of magnetic poles repel while unlike kinds of magnetic poles A) attract. B) repel also. C) may attract or repel.

A) attract

4. Changing the magnetic field intensity in a closed loop of wires induces A) current. B) voltage. C) both D) neither

A) current

A device that transforms mechanical energy to electrical energy is a A) generator. B) motor. C) transformer. D) magnet. E) none of the above

A) generator

Compressions and rarefactions are characteristic of A) longitudinal waves. B) transverse waves. C) both D) neither

A) longitudinal waves

Which of these has the longest wavelength? A) radio waves B) microwaves C) visible light D) gamma rays

A) radio waves

16. Relative to ultraviolet waves, the wavelength of gamma rays is A) shorter. B) longer. C) the same.

A) shorter

Which of the following is not a transverse wave? A) sound B) light C) radio D) all of the above E) none of the above

A) sound

The various isotopes of an element all have A) the same number of protons but different numbers of neutrons. B) the same total number of neutrons and protons. C) the same number of neutrons but different numbers of protons. D) the same number of neutrons and the same number of protons.

A) the same number of protons but different numbers of neutrons.

Boron has primarily two isotopes, one with an atomic mass of 11 amu and another with an atomic mass of 10 amu. If the abundance of the boron atom with a mass of 11 amu is 18.9 percent and the abundance of the other isotope is 81.1 percent, what would be the average mass of the boron atom? A) 10.19 amu B) 11 amu C) 10 amu D) 10.81 amu E) not enough information given

A)10.19 amu

The diameter of an average atom is about A) 10^-7 m. B) 10^-10 m .C) D-5 m. D) 10^-14 m.

B) 10^-10 m

The range of human hearing is about A) 10 Hz - 10,000 Hz. B) 20 Hz - 20,000 Hz. C) 40 Hz - 40,000 Hz. D) all of the above, depending on the person

B) 20 Hz - 20,000 Hz.

Light will not pass through a pair of Polaroids when their axes are A) parallel. B) perpendicular. C) 45° to each other. D) all of the above E) none of the above

B) perpendicular

Who discovered the atomic nucleus in 1911? A) Marie and Pierre Curie B) Henri Becquerel C) Ernest Rutherford D) Niels Bohr

C) Ernest Rutherford

Which element has chemical properties the most similar to phosphorus (P, atomic number 15)? A) O B) Na C) N D) Ar E) Br

C) N

A beam of protons and a beam of neutrons of the same energy are both harmful to living tissue. The beam of neutrons, however, is less harmful. Why? A) Neutrons are much smaller and lighter than protons and would do less damage .B) Neutrons travel at reduced speed compared to the speed at which protons travel. C) Neutrons carry no electric charge and thus have a greater likelihood of passing through the tissue. D) All of the above are reasons why neutrons are less harmful

C) Neutrons carry no electric charge and thus have a greater likelihood of passing through the tissue.

How many electrons are on the last shell of Barium? A) None B) One C) Two D) Three E) None of these

C) Two

Every spinning electron is A) electrically charged. B) is a tiny magnet. C) both D) none of the above

C) both

Magnetism is due to the motion of electrons as they A) move around the nucleus. B) spin on their axes. C) both D) neither

C) both

If a neutral element has the following chemical symbol, how many electrons does it have?𝐾39/19 A) 19 B) 9 C)39 D) 24 E) none of the above

C)39

Which element has the atomic number 53? A) Mn B) C C) I D) Na E) Be

C)I

If an electric charge is rapidly shaken up and down, A) sound is emitted. B) light is emitted. C) electron excitation occurs. D) an electromagnetic wave is produced.

D) an electromagnetic wave is produced.

Which is not a possible value for the principal quantum number n? a. 3.5 b. 2 c. 1 d. 6

a. 3.5

During a single period, the distance traveled by a wave is A) one-half wavelength. B) one wavelength. C) two wavelengths

B) one wavelength

What is the symbol for the element whose atoms have 33 protons each?A) Pr B) As C) Au D) Sg E) Fr

B) As

Which color of light comes from a greater energy transition? A) Red B) Blue C) Both comes from the same energy transition

B) Blue

Magnet A has twice the magnetic field strength of magnet B and pulls on magnet B with a force of 200 N. The amount of force that magnet A exerts on magnet B is A) at or about 100 N. B) exactly 200 N. C) more than 200 N. D) not enough information

B) Exactly 200 N

If two protons and two neutrons are removed from the nucleus of a gold atom, a nucleus of which element remains? A) iridium-194 B) iridium-192 C) gold-192 D) gold-194

B) iridium-192

If you double the frequency of a vibrating object, its period A) doubles. B) is half. C) is one quarter

B) is half

A device that transforms electrical energy to mechanical energy is a A) generator. B) motor. C) transformer. D) magnet .E) none of the above

B) motor

The diameter of an average nucleus is about A) 10-7 m. B) 10-10 m. C) D-6 m .D) 10-14 m

D) 10-14 m

A wave oscillates up and down two complete cycles each 1 s. If the wave travels an average distance of 6 m in 1 s, its wavelength is A) 0.5 m. B) 1 m. C) 2 m. D) 3 m. E) 6 m.

D) 3 m.

What is the symbol used on the periodic table for the element Selenium? A) Kr B) Re C) Np D) Se E) Er

D) Se

Evidence for the existence of neutrons did not come until many years after the discoveries of the electron and the proton. Give a possible explanation. A) The neutron is nearly massless .B) The neutron is only slightly more massive than the proton. C) The discovery required the use of ultrafast computers. D) The neutron lacks an electrical charge.

D) The neutron lacks an electrical charge.