Cathode rays are deflected by _______.

In a sodium atom (atomic number = 11 and mass number = 23) and the number of neutrons is _______.

The Balmer series in the spectrum of hydrogen atom falls in _______.

The idea of stationary orbits was first given by _______.

de Broglie equation is _______.

What is the difference in the origin of cathode rays and anode rays?

In Milikan’s experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is –1.282 × 10^–18C, calculate the number of electrons present on it.

Which of the following will not show deflection from the path on passing through an electric field? Proton, cathode rays, electron, neutron

What is the difference between atomic mass and mass number?

An atom having atomic mass number 13 has 7 neutrons. What is the atomic number of the atom?

Which series of lines of the hydrogen spectrum lie in the visible region?

Which one Fe³⁺, Fe²⁺ is more paramagnetic and why?

What is the difference between ground state and excited state?

Why does the charge to mass ratio of positive rays depend on the residual gas in the discharge tube? Why is the charge to mass ratio of all cathode rays are same?

Find energy of each of the photons which
(i) correspond to light of frequency 3×10¹⁵ Hz.
(ii) have wavelength of 0.50 Å.

Find energy of each of the photons which have the wavelength of 0.50 \(\overset { \circ }{ A } \)

What is the most important application of de Broglie concept?

Which element does not have any neutron?

Write the complete symbol for the atom with the given number (Z) and atomic mass (A).
(a) Z = 92, A = 233
(b)  Z = 4, A = 9

Calculate the de Broglie wavelength of an electron moving with 1% of the speed of light?

The kinetic energy of an electron is 4.55 x 10^-25 J. The mass of electron 9.1 x 10^-1 kg. Calculate velocity, momentum and the wavelength of the electron?

Calculate (a) wavenumber and (b) frequency of yellow radiation having wavelength 5800 Å.

What are the frequency and wavelength of a photon emitted during a transition from n = 5 state to the n = 2 state in the hydrogen atom?

A molecule of O₂ and that of SO₂ travel with the same velocity.What is the ratio of their wavelengths?

A beam of helium of atoms move with a velocity of \(2.0\times { 10 }^{ 3 }{ ms }^{ -1 }\) Find the wavelength of the particle constituting the beam. (h = 6.626 \(\times \)10^-34 Js).

Define atomic number, mass number and neutron. How are the three related to each other?