physcial science final

According to the hypothesis of de Broglie, any moving particle has

a wavelength

The original nucleus before decay is known as the:

parent nucleus

Calculate the energy En (in eV) of a hydrogen atom's electron with n = 4.

-0.85 eV

Isotopes of an element differ in their numbers of ____________.

neutrons

When an electron in an atom falls from a higher energy level to a lower one, a ______________ is ______________.

photon; emitted

What is the symbol for the element whose atoms have 3 protons each?

Li

Radioactive decay can occur over multiple decay steps.

True

The half-life for Iodine-131 is 8 days. How many half-lives will have passed after 24 days?

Three half-lives

The nucleus makes up about what percentage of the mass of an atom?

99.9%

How many protons does Radon have?

86

The mass defect for a D-T fusion reaction is calculated as 0.188 u. The MeV energy conversion factor is given as 931 MeV/u. What is the energy released by this fusion reaction?

175 meV

For a large nucleus when the number of protons exceeds 83, the nucleus:

becomes unstable

Who discovered the electron in 1887?

Thomson

Who, in 1925, postulated that matter, as well as light, has properties of both waves and particles?

de Brogile

The average mass of the atoms of an element in naturally occurring samples is called the ______________ mass of the element.

atomic

How many protons are there in an atom of 23/11 Na?

11

After 2 half-lives only _______ of the original amount of the radionuclide remains undecayed.

One quarter

The greater the frequency of light, the greater the ______________ of its photons.

energy

What is the symbol for the element whose atoms have 92 protons each?

U

Calculate the radius in nanometers of the orbit of a hydrogen atom's electron with n = 5.

1.3

Most stable types of nuclei have an ______________ number of protons and an ______________ number of neutrons.

even; even

The atomic number (Z) of an element is equal to the number of ______________ in one of its atoms.

protons

The process in which smaller nuclei combine to form larger nuclei is called nuclear fission

False

What is the symbol of the element that has 10 protons?

Ne

A rock of mass 0.100 kg is thrown with a speed of 50.0 m/s. What is its deBroglie wavelength?

1.33 x 10^-34 m

The diameter of an average nucleus is about

10^-14 m

Which is not a possible value for the principal quantum numbern?

3/2

When a hydrogen electron is in its ground state, its principal quantum number is

1

The "billiard ball model" of the atom is associated with

Dalton

What is the symbol for the element Actinium?

Ac

Matter waves are also called ___________waves.

deBrogile

Transmutation is the process whereby radioactive nuclei can spontaneously change into nuclei of other elements.

True

Calculate the energy En, in electron volts, of a hydrogen atom's electron with n = 6.

-0.378 eV

Removal of an electron from an atom leaves a

positive ion

The "plum pudding model" of the atom is associated with:

Thomson

The symbol notation now used for elements was developed by

Berzelius

_________ is the source of energy for the Sun and other stars.

Fusion

A quantum is a

discrete amount of energy

For a large nucleus, when the number of protons exceeds 83, the unstable nucleus can undergo:

Radioactive Decay

The process by which a large nucleus splits into smaller nuclei, releasing energy and emitting neutrons, is called: 

nuclear fission

How many neutrons are there in an atom of 235/92

143

The lowest energy level of a hydrogen atom (n = 1) is called

the ground state

Light can sometimes be described as a wave, and sometimes as a particle.

True

An exoergic reaction

releases energy

What is the symbol used on the periodic table for the element Rubidium?

Rb

What is the symbol for Silver?

Ag

Calculate the radius in nanometers of the Bohr orbit of a hydrogen atom's electron with n = 6.

1.91 nm

What is the symbol for the element copper?

Cu

How many electrons are there in a neutral atom of 56/26?

26

The development of physics since about 1900 is called

modern physics