Question

Solution

Correct option is

4814.8 Å line of Balmer series is obtained when     n1 = 2, n2 = 3 line of Balmer series is obtained when      n1 = 2, n2 = 4  Diving eqn. (i) by eqn. (ii), we get  SIMILAR QUESTIONS

Q1

When a certain metal was irradiated with a light of frequency

3.2 × 1016 Hz, the photo-electrons had twice the kinetic energy as emitted when the same metal was irradiated with light of frequency 2.0 × 1016 Hz. Calculate the threshold frequency (v0) of the metal.

Q2

A laser emits monochromatic radiation of wavelength 663 nm. If it emits 1015quanta per second per square meter, calculate the power output of the laser in joule per square meter per second.

Q3

An electron in a certainty Bohr orbit has velocity 1/275 of the velocity of light. In which orbit the electron is revolving?

Q4

A bulb emits light of wavelength 4500 Å. The bulb is rated as 150 watt and 8% of the energy is emitted as light. How many photons are emitted by the bulb per second?

Q5

Find the velocity (in ms–1) of electron in first Bohr orbit of radius a0. Also find the de Broglie wavelength (in m). Find the orbital angular momentum of 2porbital of hydrogen atom in units of h/2π.

Q6

To which orbit the electron in the hydrogen atom will jump after absorbing 1.94× 10–18 J of energy?

Q7

An electron in a hydrogen atom in the ground state absorbs energy equal to 1.5 time the minimum energy required to remove the electron from the hydrogen atom. Calculate the wavelength of the electron emitted.

Q8

Find out the number of waves made by a Bohr electron in its 3rd orbit.

Q9

When a certain metal was irradiated with a light of frequency

3.2 × 1016 Hz, the photoelectrons had twice the kinetic energy as emitted when the same metal was irradiated with light of frequency 2.0 × 1016 Hz. Calculate the threshold frequency (v0) of the metal.

Q10

The atomic spectrum of hydrogen is found to contain a series of lines at wavelengths 656.46, 486.27, 434.17 and 410.29 nm. What will be the wavelength of the next line in the series?