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What should be the angle of incidence of a light ray incident through air on the boundary separating air from water so that the angle of refraction is 30°? (refractive index of air is 1 and that of water is 1.32)
an object has a final velocity of 10m/s an initial velocity of 5m/s and an acceleration of 3m/s2.calculate the distance covered by this object in its motion.
A sphere of radius 6cm is moulded into a think cylindrical wire of length 32cm. Calculate the radius of the wire in SI units
Calculate the Hall coefficient for Na which has a bcc structure of cell size 0.428nm
Determine the length of guitar string required to produce a fundamental
frequency (1st harmonic) of 300 Hz. The speed of waves in a particular guitar string
is known to be 50 m/s.
Which of the following is NOT TRUE about X-rays? I
(A) Highly energetic collision can cause the inner
electrons to transit between high energy level and low
energy level.
(B) Hard X-rays could be used in deep tissue therapy.
(C) The penetration capability of X-rays can be
improved by the increase of the tube voltage.
(D) The X-rays from an X-ray tube are with a single
wavelength.
The radioactive nucleus of a given element does NOT
emit [ ].
(A) X-rays
(B) y-rays
• (C) a(alfa)particles
(D) B (beta)particles
45. The Solar Maximum Mission Satellite was placed in a circular orbit about 150 mi above Earth. Determine (a) the orbital speed of the satellite and (b) the time required for one complete revolution.
What do you think the role of communication company in the delivery of information
a 4.5 kg dog stands on an 18 kg flatboat at distance D ! 6.1 m from the shore. It walks 2.4 m along the boat towardshore and then stops. Assuming no friction between the boat and the wa-ter, find how far the dog is then from the shore.
