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Physics

Physics
Which of the following has the highest frequency?

Cosmic rays
Radio waves
Microwaves
X-rays

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Physics
Lakes freeze in cold countries in winter, leaving the water underneath at

0°C
4°C
4°F
0°F

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Physics
In case of uniform circular motion, the acceleration is

Zero
Variable in magnitude but tangential to the circle
Variable in magnitude but constant in direction
Constant in magnitude and directed radially inwards

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Physics
For a ray of light to suffer total internal reflection it has to pass from :

Air to water
Air to glass
Glass to water
Water to glass

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Physics
Transition ions absorb light in :

Infrared region
Ultraviolet region
Visible region
Microwave region

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Physics
In spherical polar coordinates (l, q, a), q denotes the polar angle around z-axis and a denotes the azimuthal angle raised from x-axis . Then the y-component of P is given by

Psinq cosa
Pcosq sina
Psinq sina
Pcosq cosa

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