When a charged oil drop moves upwards in an electric field,
When a charged oil drop moves upwards in an electric field, the electric force acting on the drop is
Options
(a) Greater than mass of oil drop (b) Equal to gravitational force (c) […]
Dual Nature of Matter and Radiation
The lowest frequency of light that will cause the emission of photoelectrons
The lowest frequency of light that will cause the emission of photoelectrons from the surface of a metal (for which work function is 1.65 eV) will be
Options
(a) 4×10¹⁰ Hz (b) 4×10¹⁴ Hz […]
The maximum kinetic energy of the photoelectrons depends only on
The maximum kinetic energy of the photoelectrons depends only on
Options
(a) Charge (b) frequency (c) incident angle (d) pressure
Correct Answer:
frequency
Explanation:
No explanation available. Be the first to write the […]
Penetrating power of X-rays does not depend on
Penetrating power of X-rays does not depend on
Options
(a) potential difference (between anode and cathode) (b) Current in the filament (c) Wavelength ( of X-rays) (d) Energy ( of X-rays)
Correct Answer: […]
Light of wavelength λᴀ and λᴃ falls on two identical metal plates A and B respectively.
Light of wavelength λᴀ and λʙ falls on two identical metal plates A and B respectively. The maximum kinetic energy of photoelectrons is Kᴀ and Kʙ respectively, then which one of the following reletions is […]
When the energy of the incident radiation is increased by 20%,
When the energy of the incident radiation is increased by 20%, the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal […]
what is the de-Broglie wavelength of the electron accelerated through a potential
what is the de-Broglie wavelength of the electron accelerated through a potential difference of 100V?
Options
(a) 12.27Å (b) 1.227Å (c) 0.1227Å (d) 0.001227Å
Correct Answer:
1.227Å
Explanation:
No explanation available. Be the […]
The most important characteristic of electron in the production of X-rays is
The most important characteristic of electron in the production of X-rays is
Options
(a) Revolution of electron around the nucleus (b) Speed of electron(Striking the target) (c) Charge of electron(Striking the target) (d) […]
For photoelectric emission to take place
For photoelectric emission to take place
Options
(a) Frequency of incident radiations should be less than threshold frequency (b) Wavelength of incident radiation should be less than threshold wavelength (c) Frequency of incident […]
Rate of photoelectric emission is proportional to
Rate of photoelectric emission is proportional to
Options
(a) Frequency of incident radiations (b) Intensity of incident radiations (c) Square of intensity radiations (d) Square of frequency of incident radiations
Correct Answer:
Intensity […]