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A uniform rod of length L and mass M is pivoted at the centre Question :- A uniform rod of length L and mass M is pivoted at the centre. Its two ends are attached to two springs of equal spring constants k. The springs are fixed to rigid supports as shown in the…
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A meter bridge is set up as shown Question :- A meter bridge is set up as shown to determine an unknown resistance X using a standard 10 ohm resistor. The galvanometer shows null point when tapping key is a 52 cm mark. The end-corrections are 1 cm and 2 cm respectively for the ends A and B. The determined value of X is: (a) 10.2 Ω (b) 10.6 Ω (c) 10.8 Ω…
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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