Popular Questions
- A microscope using suitable photons is employed to locate an electron in an atom within a distance of 0.1 Å. What is the uncertai..
- What is the total number of orbitals associated with the principal quantum number n = 3 ?
- Using s, p, d, f notations, describe the orbital with the following quantum numbers:
- (i) Calculate the number of electrons which will together weigh one gram.
- (i) Calculate the total number of electrons present in one mole of methane.
- How many neutrons and protons are there in the following nuclei ?
- Write the complete symbol for the atom with the given atomic number (Z) and atomic mass (A)
- Yellow light emitted from a sodium lamp has a wavelength (?) of 580 nm. Calculate the frequency (?) and wavenumber (? ) of the yel..
- Find energy of each of the photons which
- Calculate the wavelength, frequency and wavenumber of a light wave whose period is 2.0 × 10–10 s.
- What is the number of photons of light with a wavelength of 4000 pm that provide 1J of energy?
- A photon of wavelength 4 × 10–7 m strikes on metal surface, the work function of the metal being 2.13 eV.
- Electromagnetic radiation of wavelength 242 nm is just sufficient to ionize the sodium atom. Calculate the ionization energy of so..
- alculate the rate of emission of quanta per second
- Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of wavelength 6800 Å. Calculate thr..
- What is the wavelength of light emitted when the electron in a hydrogen atom undergoes a transition from an energy level with n = ..
- How much energy is required to ionise a H atom if the electron occupies n = 5 orbit? Compare your answer with the ionization entha..
- What is the maximum number of emission lines when the excited electron of a H atom in n = 6 drops to the ground state?
- Calculate the radius of Bohr’s fifth orbit for hydrogen atom.
- Calculate the wavenumber for the longest wavelength transition in the Balmer series of atomic hydrogen.
- The ground state electron energy is –2.18 × 10–11 ergs
- What is the longest wavelength of light in cm that can be used to cause this transition?
- Calculate the wavelength of an electron moving with a velocity of 2.05 × 107 ms–1 .
- The mass of an electron is 9.1 × 10–31 kg. If its K.E. is 3.0 × 10–25 J, calculate its wavelength
- Which of the following are isoelectronic species i.e., those having the same number of electrons?
- What is the lowest value of n that allows g orbitals to exist?
