## Question

### Solution

Correct option is Velocity of an electron = 600 ms–1      #### SIMILAR QUESTIONS

Q1

The ionisation energy of He+ is . Calculate the energy of first stationary state of Li2+.

Q2

The ionization energy of hydrogen in excited state is +0.85 eV. What will be the energy of the photon emitted when it returns to the ground state?

Q3

Calculate the wavelength associated with an electron

(mass 9.1 × 10–31 kg) moving with a velocity of 103 m sec–1

(h = 6.6 × 10–34 kg m2 sec–1)

Q4

What will be the wavelength of a ball of mass 0.1 kg moving with a velocity of 10 ms–1?

Q5

Calculate the mass of a photon with wavelength 3.6 Å.

Q6

A microscope using suitable photons is employed to locate an electron in an atom within a distance of 0.1 Å. What is the uncertainty involved in the measurement of its velocity?

Q7

Calculate the uncertainty in the velocity of a wagon of mass 3000 kg whose position is known to an accuracy of ±10 pm

(Planck’s constant = 6.63 × 10–34 Js)

Q8

Calculate the uncertainty in the position of an electron if the uncertainty in its velocity is 5.7 × 105 m/sec (h = 6.6 × 10–34 kg m2 s–1, mass of the electron = 9.1×10–31 kg).

Q9

A golf ball has a mass of 40 g and a speed of 45 m/s. If the speed can be measured within accuracy of 2%, calculate the uncertainty in position.

Q10

What is the transition in the hydrogen spectrum would have the same wavelength as the Balmer transition, n = 4 to n = 2 of He+ spectrum?