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A girl is swinging on a swing in sitting position. When the same girl stands up, the period of swing will:
Consider the following statements: A Person in a spaceship located half way between the earth and the sun will notice that the 1. Sky is jet black 2. stars do not twinkle 3. Temperature outside the spaceship is much higher than that on the surface of the earth. of these statements :
Total internal reflection can take place when light travels from :
An air bubble in water will act like a
Suppose a rocketship is receding from the earth at a speed of 2/10 th the velocity of light.A light in the rocketship appears blue to the passengers on the ship. What colour would it appear to an observe on the earth ?
When an air bubble at the bottom of lake rises to the top,it will
Which one of the following can be used to confirm whether drinking water contains a gamma emitting isotope or not ?
The technique used to transmit audio signals in television broadcasts is
When the same note is played on a sitar and a flute,the sound produced can be distinguished from each other because of the difference in
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