Calculate the time period (in seconds) of a sound wave of wavelength 4m traveling with a speed of 500m/s
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The material used in electric heater is
A broadcasting station transmits waves with a frequency of 71 x 104 Hz and a speed of 3 x 108 m/s. The wavelength of the wave is
When a ray of light travels from a denser medium to a rarer medium, it bends
Magnetic striping is evidence of
Magnetic striping is evidence of seafloor spreading.
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The tendency of undisturbed objects to stay at rest or to keep moving with the same velocity is called ___
The laws which govern the motion of planets are called ___________________.
If a ball is thrown up, which of the following does not change?
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