Q1- A cell phone broadcasts 800 MHz signal. If it is operated from the space between two massive radio-wave absorbing buildings with 15 m space between them, what is the angular width of the electromagnetic wave after it emerges from between the buildings?
Q2- How far behind the pinhole should the …
On request - Mandy
Q- A bungee jumper of mass m is attached to one end of an elastic rope of length L and force constant k. The other end is fixed to a high bridge. The jumper steps off the bridge and falls from rest. If he just reaches the surface of river before going up again find
(a) The heigh…
Q1- Light of wavelength 589 nm from a sodium lamp illuminates two narrow slits. The fringe spacing on a screen 150 cm behind the slits is 4.0 mm. What is the spacing between the two slits?
Q2- A double-slit experiment is performed with light of wavelength 600 nm. The bright interference fringes a…
Q- An aluminum rod has a resistance of 1.234 Ohm at 20.0°C. Calculate the resistance of the rod at 120°C by accounting for the changes in both the resistivity and its dimensions. (Resistivity of aluminum at 200C is 2.75*10-8 Ohm.m, temperature coefficient of resistivity is 4.4*10-3/0C and the coef…
On request - Kamal
Q- A truck weighing 1 tonne rests on a slope of 30 degrees with its brakes locked. Due to rain the coefficient of friction between the tires and road reduces to 0.3 and the truck starts sliding down the slop under its own weight. What is the net acceleration of the truck down the…
Q- Air is trapped in the lower part of a thin tube that stands vertically with 8cm of mercury in the middle with 12 cm of air trapped below it. The top is open and the system is at equilibrium. What will be the length of the trapped air column if the tube is now tilted so that it makes an angle of 6…
Q- Two point charges q1 = (+) 1µC and q2 = (+) 9µC are separated by a distance of 50cm.
(a) Find the magnitude and direction of the Coulomb force on each charge due to the other.
(b) At what point on the line joining the two charges should a charge q = (-) 1µC be placed so that the net force on …
Q- In the figure q1 = 4µC, q2 = -3µC and q3 =q4= -2µC.
a. What is the magnitude of force exerted on charge q1 by charge q2?
b. What is the magnitude of force exerted on charge q1 by charge q3?
c. What is the horizontal component of force exerted on q1 by q3?
d. What is the resultant force e…
Q- The tenth brightest member of the cluster of galaxies known as 'Abell1185' has a brightness of 2.70*1010 Wm-2. A line in its spectrum at a wavelength of 503.1 nm is identified as being a member of the Balmer series that has a rest wavelength of 486.1 nm. Consider the luminosity of the tenth brigh…
A half-ring with a radius 9 cm has a total charge 10 µC uniformly distributed along its length.
(a) What is the linear charge density on the ring?
(b) What is the magnitude of the electric field at the center of the half-ring?
Q- Joan goes skydiving. As she is falling at terminal velocity, she screams very loudly with a frequency of 1500 Hz. If her friend on the ground directly below her measures the frequency of her scream to be 2000 Hz, how fast is she falling? She hears the echo of her scream as it bounces off the grou…
(Requested by Marie)
Q-1 The length of the uncompressed spring is 11.0 cm. The diameter of the wire used to make the spring has been measured using a micrometer screw gauge and has a value of 1.60 mm. The spring has twelve complete turns. When the spring is compressed, the coils are all touching. C…
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