Physics Chapter on Waves and Atomic Models

False (B)

Hertz (Hz)

<p>second</p> Signup and view all the answers

<p>Wavelength = Number of waves passing a point in one second Frequency = Distance covered by a wave in one second Velocity = Distance between two nearest crests or troughs Wave number = Reciprocal of the wavelength</p> Signup and view all the answers

<p>It is impossible to measure simultaneously the exact position and exact momentum. (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>A branch of science that takes into account the dual behavior of matter.</p> Signup and view all the answers

<p>circular</p> Signup and view all the answers

<p>Orbit = Circular path around the nucleus Orbital = Region in space with maximum probability of finding an electron Heisenberg Uncertainty Principle = Limits simultaneous measurement of position and momentum Quantum Mechanics = Study of dual behavior of matter</p> Signup and view all the answers

<p>Isotopes have the same nuclear charge but different number of neutrons. (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Plum-Pudding model</p> Signup and view all the answers

<p>closed orbits</p> Signup and view all the answers

<p>Thomson's model = Uniform sphere of positive charge Rutherford's model = Electrons in closed orbits Isotopes = Same nuclear charge, different neutrons Isobars = Same mass number, different atomic number</p> Signup and view all the answers

<p>It cannot explain atomic stability. (A)</p> Signup and view all the answers

<p>Energy transmitted in the form of waves that travel at the speed of light.</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>An ideal body that emits and absorbs uniform radiations of all frequencies (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>photon</p> Signup and view all the answers

<p>photoelectric effect</p> Signup and view all the answers

<p>Threshold frequency = Minimum frequency for the photoelectric effect Work function (Wo) = Minimum energy required for the photoelectric effect Photon = Smallest packet of light energy Black body radiation = Radiation emitted uniformly by a black body</p> Signup and view all the answers

<p>Electrons are ejected only if the light has a suitable frequency (C)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Proportional</p> Signup and view all the answers

<p>Shape and orientation of orbitals (A)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>18</p> Signup and view all the answers

<p>orientations</p> Signup and view all the answers

<p>Principal quantum number (n) = Describes the size and energy of the electron Azimuthal quantum number (l) = Indicates subshell shape Magnetic quantum number (ml) = Describes orientation of the subshells Spin quantum number = Specifies the spin of the electron</p> Signup and view all the answers

<p>p (B)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>0, 1</p> Signup and view all the answers

<p>f (C)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>+1/2 and -1/2</p> Signup and view all the answers

<p>2</p> Signup and view all the answers

<p>s = 1 p = 3 d = 5 f = 7</p> Signup and view all the answers

<p>A region where finding the electron has zero probability (D)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>5</p> Signup and view all the answers

The arrangement of different electromagnetic waves, ordered by increasing frequency or decreasing wavelength.

The distance between two consecutive crests or troughs of a wave.

The number of waves passing a fixed point in one second.

The speed at which a wave travels through a medium.

The reciprocal of wavelength, representing the number of waves present in a given unit of length.

Atoms of the same element with the same number of protons (atomic number) but different numbers of neutrons.

Atoms of different elements with the same mass number but different atomic numbers (number of protons).

Thomson's model, also known as the 'plum pudding model', describes the atom as a sphere of positive charge with electrons embedded like plums.

Rutherford's model describes the atom as having a dense, positively charged nucleus at the center surrounded by electrons orbiting in circular paths.

Rutherford's model couldn't explain the stability of the atom. According to classical physics, electrons should constantly radiate energy and spiral into the nucleus, causing the atom to collapse.

Electromagnetic radiation is energy that travels in waves, like light, at the speed of light. It is also called radiant energy.

Electrons in Rutherford's model were supposed to lose energy as they orbit, causing them to spiral into the nucleus. But this doesn't happen, meaning electrons don't continuously lose energy.

The spectrum of light emitted by an atom is not continuous but consists of distinct lines. This indicates that electrons do not lose energy continuously in an atom.

An ideal object that absorbs and emits all frequencies of electromagnetic radiation equally.

Electromagnetic radiation emitted by a black body.

The idea that energy is emitted or absorbed in discrete packets called quanta.

The smallest packet of energy in electromagnetic radiation, specifically light.

The minimum frequency of light required to eject electrons from a metal surface.

The minimum energy required to remove an electron from a metal surface.

The emission of electrons from a metal surface when light of sufficient frequency strikes it.

The kinetic energy of an emitted electron is equal to the energy of the incoming photon minus the work function.

A principle stating that it's impossible to simultaneously know both the exact position and exact momentum of a particle like an electron.

The dual nature of matter, meaning it can behave both as a wave and a particle.

A branch of physics that incorporates the wave-particle duality of matter, explaining the behavior of microscopic particles.

A circular path around the nucleus where electrons revolve.

A region of space around the nucleus where there's a high probability of finding an electron.

A way to describe the size and energy of an electron in an atom.

The principal quantum number (n) can be any positive whole number, representing the major energy level or shell.

The maximum number of electrons that can occupy a shell is calculated by 2n² where n is the principal quantum number.

The Azimuthal Quantum number (l) describes the shape and energy of the subshells within a shell.

The number of subshells within a shell is equal to the principal quantum number (n).

For a given shell, l can have values from 0 to (n-1)

It specifies the orientation of an orbital in 3D space.

The values of ml range from -l to +l, including 0.

The number of orbitals within a subshell can be calculated by the formula (2l+1), where 'l' is the azimuthal quantum number, which itself defines the subshell.

An orbital represents a region of space around the nucleus where there is a high probability of finding an electron. Each orbital can hold up to two electrons.

The 's', 'p', 'd', and 'f' subshells represent different shapes and orientations of orbitals. The 's' subshell is spherically shaped, the 'p' subshell has 3 dumbbell-shaped orbitals, the 'd' subshell contains 5 orbitals with different shapes, and the 'f' subshell has 7 more complex shapes.

The total number of orbitals present in a specific principal energy level (n) can be determined using the formula n² . For instance, the first energy level (n=1) has 1² (1) orbital, the second level (n=2) has 2² (4) orbitals, and so on.

Representing the intrinsic angular momentum of an electron. It can have two possible values: +1/2 (spin up) and -1/2 (spin down). This signifies that each orbital can hold up to two electrons, each having opposite spins.