Answers created by vrma

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• Can any body explain Davisson and Germer experiment with graph ?
  
• How does thermal expansion affect the accuracy of a pendulum clock?
  
• A wave whose speed in a snakey is 4.4 m/s enters a second snakey. the wavelength changes from 2 m to 3 m. what is the speed of the wave at second snakey?
  
• Please i really need this !!! how do you solve the system of equations x-2y=18 , 3x-2y=-10?
  
• An object with a mass of #12 kg# is on a plane with an incline of # - pi/6 #. If it takes #6 N# to start pushing the object down the plane and #4 N# to keep pushing it, what are the coefficients of static and kinetic friction?
  
• If speed of a body is increased by 1 percent...what is the change in its kinetic energy?
  
• A semiconductor has a band gap of 1.5 eV. What is the minimum wavelength in nm required to promote an electron from the valence to the conduction band?
  
• In harmonic oscillator transition from ground state to second excited state is forbidden, why?
  
• Question is about finding force etc.?
  
• Limiting equilibrium means #ma=0# In #F-f=ma# ?
  
• A block of cubic zirconia is placed in water (n = 1.33). A laser beam is passed from the water through the cubic zirconia. The angle of incidence is 50 deg, and the angle of refraction is 27 degrees. What is the index of refraction of this cubic zirconia?
  
• When monochromatic light shines perpendicularly on a soap film (n= 1.35) with air on each side, the second smallest nonzero film thickness for which destructive interference of reflected light is observed is 296 nm . What is the wavelength of the light ?
  
• 5. If the four-wheeler has a top speed of 25 mph, will Stanley and his friend be able to use this method to determine if the whistle is functioning?
  
• An body with a mass of #6 kg# is on a slope at an incline of #pi/5 #. If the body is being pushed up the slope with a force of # 4 N#, what is the minimum coefficient of friction required for the body to remain at rest?
  
• When we use this laws?
  
• Particles *P* and *Q* move on a line of greatest slope of a smooth inclined plane. *P* is released from rest at a point *O* on the line and 2s later passes through the point *A* with speed #3.5ms^-1#. (i) Find the acceleration of *P* and the angle?
  
• Mechanics question help on forces?
  
• F. what is the orbital diagram and the corresponding electron configuration of 26Fe?
  
• A ball is thrown upward from the ground with an initial speed of 25 m/s; at the same instant, another ball is dropped from a building 15 m high. After how long will the balls be the same height?
  
• An object with volume 6.0*10^1 m^3 and mass of 2.600*10^4 kg will have bouyancy force,in ethyl alcohol?
  
• A screw gauge gives the following reading when used to measure the diameter of a wire. Main scale reading=6mm. Circular scale reading=64 divisions. Given that 1 mm on main scale corresponds to 100 divisions of circular scale.What is the diameter of wire?
  
• Please solve this wave-optics based question?
  
• Why radioactivity is a nuclear phenomena even there is change in electrons ? Example. Uranium with 92 electron changes to thorium with 90 electron
  
• Two bodies are projected at angle theta and 90 minus theta to the horizontal with the same speed the ratio of their maximum vertical height is?
  
• If a projectile is shot at an angle of #(3pi)/8# and at a velocity of #7 m/s#, when will it reach its maximum height?
  
• A model train, with a mass of #4 kg#, is moving on a circular track with a radius of #6 m#. If the train's kinetic energy changes from #16 j# to #80 j#, by how much will the centripetal force applied by the tracks change by?
  
• What is the difference between a fermion and a boson?
  
• When the time interval between seeing the lightening and hearing the thunder is short, the thounder is loud. Why?
  
• How is angular momentum quantized?
  
• How does einstein's equation change the law of conservation of energy?
  
• What is a agonimeter?
  
• Two particles #X# and # Y# having equal charges, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular path of radius #R_1#, and #R_2# respectively. What is #X/Y#?
  
• The wavelength of a photon is 10A find its energy? 2
  
• A clean nickel surface (work function 5.1eV), is exposed to light of wavelength 206nm. What is the maximum speed of the photoelectrons emitted from this surface?
  
• Image formed by convex mirror?
  
• A radioactive isotope of potassium (K) has a half-life of 20 minutes. If a 40.0 gram sample of this isotope is allowed to decay for 80 minutes, how many grams of the radioactive isotope will remain?