Physics
Which of the following characteristics of light remains unchanged when light travels from vaccum enters water

Speed
Frequency
Wavelength
Amplitude

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Physics
What is the principle of a ''Life Jacket"?

It increases the volume of the person to keep him afloat
The person can sit on it like a raft
It provides oxygen to a drowning person
It decreases the volume of the person to keep him afloat

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Physics
Absolute Zero is defined as

At which water boils at 298K
The temperature at which all molecular motion ceases
At which liquid Helium boils
At which the volume becomes zero

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