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

Amplitude
Wavelength
Frequency
Speed

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Physics
RADAR is used for:

locating submerged submarines.
detecting and locating the position of objects such as Aeroplanes.
locating geostationary satellites.
receiving a signals in a radio receiver.

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Physics
Plants are dried up in winter due to frost because

Evaporation does not take place
Respiration does not take place at low temperature
There is mechanical loss of tissues and drought condition prevails
Photosynthesis does not take place at such low temperature

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