Structure of atom practice · Medium

An electron is accelerated from a very low velocity ($\sim$ zero speed) by the application of a potential difference of $\mathrm{V}$ volts. If the de Broglie wavelength should change (i.e., decrease) by $1.0 \%$ what percent increase in $\mathrm{V}$ causes it-

Which experiment is responsible for finding out the charge on an electron?

The energy of a photon is $3 \times {10^{ - 12}}$ ergs. What is its wavelength in nm? $\left( {h = 6.62 \times {{10}^{ - 27}}\mathrm{ergs},\;c = 3 \times {{10}^{10}}\mathrm{cm}/\mathrm{s}} \right)$

What is the maximum number of electrons in an atom that can have the following quantum numbers $n = 4,\;{m_1} = + 1?$

The radius of Bohr's first orbit in H-atom is 0.053 nm. The radius of second orbit in $\mathrm{H}{\mathrm{e}^ + }$ would be:

Assertion: Dalton's Atomic Theory was later modified when the existence of subatomic particles was discovered.

Reason: The discovery of subatomic particles showed that atoms are not indivisible and can be further broken down into smaller particles.

The radius of the stationary state which is also called Bohr radius is given by the expression $\mathrm{r_n=n^2 a_0}$ where the value of $\mathrm{a}_0$ is

Which hydrogen like species will have same radius as that of Bohr orbit hydrogen atom?

The expression for Bohr's frequency rule is

It the radius of first Bohr orbit be ${a_\mathrm{o}}$, then the radius of the third orbit would be

S-I: Wavelength of limiting line of lyman series is less than wavelength of limiting line of Balmer series.

S-II: Rydberg constant value is same for all elements.

The maximum number of electrons accommodated in all 5f-orbitals

In $\mathrm{H}$-atom, the wave number ratio is $108: 7$ is for

Assertion: Ratio of anode rays is different for different gases.
Reason: Proton is the fundamental particle present in gases.

Angular momentum of 2nd Bohr orbit of H – atom is $x$ . Then find out angular momentum in first excited state of $L{i^{2 + }}$ is

If an electron has spin quantum number of $+ \frac{1}{2}$ and a magnetic quantum number of -1, it cannot be represented in an

If the mass of an electron is $9.11 \times {10^{ - 31}}\,{\text{kg}},$ and uncertainty in position is ${10^{ - 8}}{\text{m}},$ the uncertainty in velocity would be:

For ${ }^{19} {F}^{-1},{ }^{16} {O}^{-2}, { }^{20} {Ne},$ choose the correct statement.

The mass of a photon with wavelength 3.6 Å  is

A dye emits $50 \%$ of the absorbed energy as fluorescence. If the number of quanta absorbed and emitted out is in the ratio $1: 2$ and it absorbs the radiation of wavelength ' $x$ ' $\mathop {\text{A}}\limits^ \circ$, then the wavelength of the emitted radiation will be

Which are in the ascending order of wavelength?

Calculate the wave number for the shortest wavelength transition in the Balmer series of atomic hydrogen.

Which of the followings sets of quantum numbers represents the highest energy of an atom?

How many sets of four quantum number are possible for the electrons present in $\mathrm{H}{\mathrm{e}^{2 - }}?$

Which of the following has maximum energy

The radius of hydrogen atom in the ground state is $0.53{A^0}$. The radius of $L{i^{2 + }}$ ion (atomic number =3) in a similar state is

The presence of charge particles in the atoms was first confirmed by

Time period of a wave is $5 \times {10^{ - 3}}s$, what is the frequency?

A photon of light of wavelength 6000 Å has energy $E$. What will be the wavelength of photon of a light which has energy of photon $4 E$ ?

Select the incorrect option among the following