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1. A card containing two slits separated center-to-center by 0.1mm, is illuminated by a red laser (lambda = 632:82nm). If the fringes on an observing screen are to be 10mm apart, how far away (in m) should the screen be?
2. Two parallel slits 0.1mm apart are illuminated and it is found that the fifth bright fringe is at an angle of 1.2 degree. Determine the wavelength of the light (in nm).
3. Two 1MHz radio antennas emitting in-phase are separated by 600m along a north-south line. A radio placed 20km east is equidistant from both transmitting antennas and picks up a fairly strong signal. How far north (in km) should that receiver be moved if it is again to detect a signal nearly as strong.
A converging lens (f = 12.2 cm) is located 29.4 cm to the left of a diverging lens (f = -5.64 cm). Find the overall magnification
A small block of aluminum (of mass 0.08 kg and specific heat 900 J/kg·K) at 365 K is placed in a container of water (of mass 0.125 kg and specific heat 4186 J/kg·K) at 273 K. What is the final temperature of the two bodies
q1. an electron with a speed of 6.12 times 108 cms in the positive direction of an x axis enters the electric field of
What is an electric field between the plates? Towards which plate is it directed.
a battery has an emf and an internal resistance r. when the battery is connected to a 25omega resistor the current
The position of a particle in cm is given by x = (5) cos 5?t, where t is in seconds. What is the amplitude of the particle's motion
Calculate the heat capacity of a gas sample from the following information : The sample comes to equilibrium in a flask at 298.15 K and 121.3 kPa. A stopcock is opened briefly, allowing pressure to drop to 101.3 kPa.
a battery of emf 10 v and internal resistance 3nbspomega is connected to a resistor. if the current in the circuit is
The catapult on an aircraft carrier can take an aircraft from 0 to 216 mph in 8 seconds, at which time the aircraft launches
q1. a wave on a slinky has a frequency of 1.69 hz. it takes 4.1 s to travel the length of the slinky 0.29 m. what is
The rhinestones in costume jewellery are glass with index of refraction 1.50 to make them more reflective they are often coated by a layer of silicon monoxide of index of refraction 2.00 what is the minimum coating thickness required to ensure that l..
Mary needs to row her boat across a 120{\rm m} -wide river that is flowing to the east at a speed of 1.5{\rm m/s}. how far downstream will she land
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