The speed of an electron having a wavelength of 10⁻¹⁰ m is
The speed of an electron having a wavelength of 10⁻¹⁰ m is
Options
(a) 6.26×10⁶ m/s (b) 5.25 x10⁶ m/s (c) 7.25×10⁶ m/s (d) 4.24×10⁶ m/s
Correct Answer:
7.25×10⁶ m/s
Explanation:
λ = h […]
Physics
Einstein’s photoelectric equation is
Einstein’s photoelectric equation is
Options
(a) Emax=hν-φ (b) E=mc² (c) E²=p²c²+m₀²c⁴ (d) E=(1/2)mv²
Correct Answer:
Emax=hν-φ
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting […]
The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function
The threshold wavelength for photoelectric effect of a metal is 6500 Å. The work function of the metal is approximately
Options
(a) 0.1 eV (b) 1 eV (c) 2 eV (d) 3 eV
The de-Broglie wavelength of an electron is the same as that of a 50 KeV X-ray photon.
The de-Broglie wavelength of an electron is the same as that of a 50 KeV X-ray photon. The ratio of the energy of the photon to the kinetic energy of the electron is (the energy […]
If the wavelength of incident light falling on a photosensitive material decreases,
If the wavelength of incident light falling on a photosensitive material decreases, then
Options
(a) photoelectric current increases (b) stopping potential decreases (c) stopping potential remains constant (d) stopping potential increases
Correct Answer: […]
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) […]
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 […]