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8 cells each of internal resistance Question :- 8 cells each of internal resistance 0.5 Ω and emf 1.5V are used to send a current through an external resistor of (a) 200 Ω (b) 0.002 Ω (c ) 1.0 Ω. How would you arrange them to get the maximum current in each case? Find…
A point source causes photoelectric effect Question :- A point source causes photoelectric effect from a small metal plate. Which of the following curves may represent the saturation photocurrent as a function of the distance between the source and the metal? Solution :- If number of photons falling on the plate increases then the…
Light of frequency 1.5 times the threshold frequency Question :- A light of frequency 1.5 times the threshold frequency is incident on photo-sensitive material. If the frequency is halved and intensity is doubled, the photoelectric current becomes (A) quadrupled (B) doubled (C) halved (D) zero Solution :- Given that light of frequency 1.5 times…
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Consider the spring-mass system, with the mass submerged in water as shown in the figure Question :- Consider the spring-mass system, with the mass submerged in water as shown in the figure. If mass is released with spring at natural length, then momentum-position diagram for one cycle of this system is (take down direction…
A particle rests in equilibrium under two forces of repulsion whose centres are at a distance of a and b from the particle. Question :- A particle rests in equilibrium under two forces of repulsion whose centres are at a distance of a and b from the particle. The forces vary as the cube of the distance. The…
A light beam of wavelength 400 nm is incident on a metal plate of work function 2.2 eV. A particular electron absorbs a photon and makes two collisions before coming out of the metal. Assuming that 10% of the extra energy is lost to the metal in each collision, find the kinetic energy of this…
An ultraviolet light of wavelength 2000 angstrom causes photo emission from a surface. The stopping potential is 2 volt. Find the work function in electron volt and the maximum speed of the ejected photoelectrons. An ultraviolet light of wavelength 2000 angstrom…… :- Solution :- Using Einstein photoelectric equation, Now, as ⇒ vmax = 8.4…
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A photon with energy of 4.9 eV ejects photoelectrons from tungsten. When the ejected electron enters a constant magnetic field of strength B = 2.5 mT at an angle of 60∘ with the field direction, the maximum pitch of the helix described by the electron is found to be 2.7 mm. Find the work function…
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When a beam of 10.6 eV photons of intensity 2Wm-2 falls on a platinum surface of area 1.0×10−4 m2 and work function 5.6 eV, 53% of the incident photon eject photoelectrons. Find the number of photoelectrons emitted per second and their minimum and maximum energies (in eV). When a beam of 10.6 eV photons of intensity……. :- Solution….
Question :- The velocity of end A of a rigid rod placed between two smooth vertical walls is u along vertical direction. Find out the velocity of end B of that rod, rod always remains in contact with the vertical wall and also find the velocity of centre of rod. Also find equation of path of centre of…
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