Chemistry Question Bank

In the photoelectric effect, the number of photoelectrons emitted is proportional to:

The value of a₀ (Bohr radius) in the expression for the radius of nth orbit of hydrogen atom (rₙ = n²a₀) is

The correct order of increasing wavelength of electromagnetic radiations is

Einstein's theory of photoelectric effect is based on:

The energy of an electron in the 3rd orbit of hydrogen atom is

Electronic energy is negative because

Atoms can be further divided into sub-particles like

The smallest and lightest positive ion obtained from hydrogen is called

Rank the following radiations from highest energy to lowest: X-ray, ultraviolet, visible, infrared, microwave

The energy ratio of photons of wavelength 3000 Å and 6000 Å is

The kinetic energy of photoelectrons does NOT depend upon

The minimum frequency ν₀, below which the photoelectric effect is not observed, is called

The Bohr orbit radius for hydrogen atom (n = 1) is 0.529 Å. The radius for the first excited state (n = 2) orbit is

According to Bohr model, angular momentum of an electron in the 3rd orbit is

The oil drop experiment was developed by

Early Indian and Greek philosophers were of the view that 'A' are the fundamental building blocks of matter. Here, 'A' refers to

Mass of neutron is about ________ times the mass of the electron.

Positive rays (canal rays) are:

The relationship between frequency (ν), wavelength (λ) and velocity of light (c) is

The number of wavelengths per unit length is called

The relation between energy of radiation and its frequency was given by:

According to Planck, the smallest quantity of energy that can be emitted or absorbed in the form of electromagnetic radiation is called

Increasing the frequency of incident radiation in the photoelectric effect increases the:

The photoelectric effect shows:

Which of the following statements does NOT form a part of Bohr's model of hydrogen atom?