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Radiography and depletion of Ozone layer:
What is Radiography?
A. The method in which soft X-rays are used in medical diagnosis is called radiography.
What are the uses of Hard x-rays?
A. Hard x-rays are used to determine the structure of materials and to test the materials in industry.
What is the reason of depletion of Ozone layer in atmosphere?
A. The ozone layer is depleted due to the Chemical reactions with fluoro carbons released from aerosol sprays, refrigeration equipments and other pollutants.
Tiger Woods can hit a golf ball with 55 N of force. How hard does the ball hit back on the club? (a) more than 55 N of force, (b) less than 55 N of force, (c) exactly 55 N of force
The position of an airplane as a function of time is shown in the figure below. a. What is the average velocity of the airplane? b. What is the average speed of the air
A block is placed under the head of the claw hammer to aid in removing the nail. The pull on the handle is P39 N, the angle of the hammer to the vertical is P40 and the length of
what is a projectile
The molecules of diatomic and linear polyatomic gases are made up of two atoms joined rigidly to one another by a bond. Such a particle cannot only move as a entire but can also ro
representation of graphs
An electric kettle has a resistance of30?. What current will ?ow when it is connected to a 240V supply? Find also the power rating of the kettle A current of 5A ?ows i
What are radiation hazards? Mention four safety measures which should be taken against radioactive radiation. OR Explain radio isotopes? Write their any four uses. Descri
(i) Electric field lines come out of positive charge and go into the negative charge. (ii) Tangent to the field line at any point gives the direction of the field at that point.
Draw the circuit diagram of a common-emitter amplifier using an n-p-n transistor, Draw the Input and 1p waveforms of the signal. Write the expression for its voltage gain
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