Question Text
Question 2 :
Which of the air pressures is appropriate for the production of cathode rays in the discharge tube?<br>
Question 4 :
The lamp whose working is based on a discharge tube is ________ .
Question 6 :
which of the following statements are true w.r.t. ruthenford's model of an atom
Question 8 :
The idea of quantum nature of light has emerged in an attempt to explain :<br/>
Question 9 :
A strong argument for particle nature of cathode rays is that they
Question 12 :
Assertion: Neutrons penetrate matter more readily as compared to protons.
Reason: Neutrons are slightly more massive than protons.
Question 14 :
The $KE$ of the electron in an orbit of radius $r$ in hydrogen atom is : ($e=$ electric charge)
Question 16 :
The total energy of the electron in the hydrogen atom in the ground state is -13.6 eV. Which of the following is its kinetic energy in the first excited state?
Question 17 :
If a retarding potential of 1 V is applied between electrodes at what limiting wavelength $\lambda$ of light incident on the cathode will the photoelectric effect begin?
Question 18 :
Whatshould retarding potential differencebe applied between electrodes of the photocell for the photocurrent to drop to zero?
Question 19 :
In an electron gun,the potential difference between the filament and plate is 3000V. What will be the velocity of electron-emitting from the gun?
Question 20 :
The Rutherford $\alpha$-particle experiment shows the most of the $\alpha$-particles pass through almost unscattered while some are scattered through large angles. What information does it give about the structure of the atom?<br>