Question 1 :
What change is noticed  in cathode ray tube when  the anode voltage is increased ?
Question 3 :
Name a device which is commonly used to convert an electric signal into a visual signal.
Question 6 :
How will you relate velocity of cathode rays to c, if ‘c' denotes the velocity of light?<br/>
Question 7 :
Which of the following statement hold true w.r.t. thomsons model atom
Question 8 :
The fluorescence of the glass (discharge) tube at very low pressure is characteristic of ________ .
Question 9 :
Cathode ray tube is operating at 5 kV. Then ,what is the K.E. acquired by the electrons ?<br/>
Question 10 :
The idea of quantum nature of light has emerged in an attempt to explain :<br/>
Question 12 :
According to Rutherford's  $\alpha$-scattering experiment, which of the following statement is true?<br/>
Question 13 :
In a vacuum diode, the space around the cathode which is filled with electrons, is called ________ .
Question 14 :
according to Ruther-fordis atomic model, the mass of the atom is evenly distributed throughout the atom
Question 15 :
How can the brightness of the pattern on the screen or cathode ray tube be changed ?
Question 16 :
According to the quantum theory of light, the energy of light is carried in discrete units called
Question 17 :
According to classical theory, the path of electron in Rutherford atom nuclei is<br/>
Question 18 :
Name a device which is commonly used to convert an electric signal into a visual signal
Question 21 :
Electrons of mass m and charge e are accelerated through a potential difference V and strike the target. The maximum speed of these electrons is<br>
Question 22 :
In Thomsons experiment for determining e/m, thepotential difference between the cathode and theanode is same as that between the deflecting plates( in the region of crossed fields). If the potentialdifference is doubled. Then the factor by which themagnetic field be increased to ensure that theelectron beam remains undeflected is:<br>
Question 23 :
The p.d. at the ends of a cathode ray tube is increased to 9 times its original potential difference Then<br/>I. The velocity of cathode rays increases to .... times<br/>II. The energy of cathode rays increases to.... times<br/>
Question 24 :
In Thomson's experiment, the same H.T. supply provides potential to the anode, as also to the positive deflecting plate in the region of crossed fields. If the supply voltage is doubled, then the value of new magnetic field to keep the electron beam undeflected will be
Question 26 :
In a Rutherford experiment, the number of particles scattered at $90^{\circ}$ angle are 28 per minute then number of scattered paticles at an angle $60^{\circ}$ and $120^{\circ}$ will be<br>
Question 27 :
The cathode ray particles originates in a discharge tube from the
Question 28 :
Ultraviolet light of wavelength ${\lambda}_{1}$ and ${\lambda}_{2}$ when allowed to fall on hydrogen atoms in their ground state is found to liberate electron with kinetic energy $1.8\ eV$ and $4.0\ eV$ respectively. Find the value of $\dfrac {{\lambda}_{1}}{{\lambda}_{2}}$.<br>
Question 30 :
Three particles having charges in the ratio of 2 : 3 : 5 produce the same point on the photographic film in Thomson experiment. Their masses are in the ratio of
Question 31 :
In hydrogen atom, if the difference in the energy of the electron in $n=2$ and $n=3$ orbits is $E$, the ionization energy of hydrogen atom is
Question 32 :
Cathode rays of velocity$\displaystyle 10^{6}ms^{-1}$ describe an approximate circular path of radius 1m in an electric field of$\displaystyle 400 V cm^{-1}.$ If the velocity of cathode rays is doubled, the value of the electric field needed so that the rays describe the same circular path is
Question 33 :
The force experienced by a moving electron whichis entering into a condenser perpendicular to thedirection of electric field having its plates 0.1m apartand potential difference of 300 V is<br>
Question 34 :
Let E, G and N represent the magnitudes of electromagnetic, gravitational and nuclear forces between two electrons at a given separation. Then<br>
Question 35 :
The velocity of electrons accelerated by potential difference of $1\times 10^{4}V$ (The charge of the elctron is $1.6\times 10^{-19}C$ and mass is $9.11\times10^{-31}$kg) is<br/>
Question 36 :
Rutherford was the first physicist to carry artificial transmutation from one element into another. In his experiment he bombarded nitrogen with alpha particles to produce isotope of.
Question 37 :
In a cathode ray tube, what is the effect on the beam of particles if the anode voltage is increased ?
Question 38 :
A radio transmitter operates at a frequency of 1000 kHz and a power of 66 kW. Then, the number of photons emitted per second is
Question 39 :
In $1911$, the physicist Emest Rutherford discovered that atoms have a tiny, dense nucleus by shooting positively charged particles at a very thin gold foil. A key physical property which led Rutherford to use gold that it was.<br>
Question 40 :
An electron is accelerated by a Potential Difference of 1000V. Its velocity will be
Question 41 :
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 42 :
What will be the velocity of the electron when it just reaches the positive plate?<br>
Question 43 :
In Rutherford's alpha particle scattering experiment with thin gold foil, 8100 scintillations per minute are observed at an angle of 600. The number of scintillations per minute at an angle 1200 will be
Question 44 :
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?
