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According to their frequencies, waves are separated into three categories:
(1) Audible or sound waves : Range 20 Hz to 20 KHz. These are formed by vibrating bodies like as vocal cords, membrane or stretched strings.
(2) Infrasonic waves : Frequency lie below 20 Hz.
Example : waves formed during earth quake, ocean waves etc.
(3) Ultrasonic waves : Frequency greater than 20 KHz. Human ear cannot listen these rays, certain creatures such as dog, bat and mosquito show result to these.
Q. What is the longest lasting synthetic periodic element? Answer:- A excellent candidate would be curium 247 (247Cm) which has a half-life of 1.56 × 107 year
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experiment measuring moment of magnet
A point source of light is taken at the bottom of a tank containing water (n for water = 4/3) to a depth of 0.5 m. Determine the area of the circular patch through which light from
Which of the following isn't true of an electric field? Answer An electric field can as well as does exist in vacuum. Except for the one about vacuum the entire the answe
In order to obtain p-type germanium it should be doped with a (A) Trivalent impurity. (B) Tetravalent impurity. (C) Pentavalent impurity. (D) Any of the above will d
What is Rdiography.
The nucleus of the element having atomic number 25 and atomic weight 55 will contain : (1 )25 protons and 30 neutrons (2) 25 neutrons and 30 protons (3) 55 protons (4)
The loudness of sound depends on: Amplitude of vibration. Area of vibrating body. Distance from the sounding body. Density of the medium.
Why nuclear fission preceeds nuclear fusion?
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