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  1. If the earth shrink such that its mass does not change but radius decreases to one
  2. A sound absorber attenuates the sound level by 20 dB. The intensity decreases
  3. The maximum wavelength of radiations emitted at 900K is 4 µm. What will be the maximum
  4. A straight conductor of length 0.4 m is moved with a speed of 7 ms⁻¹perpendicular
  5. Given a sample of radium-226 having half-life of 4 days. Find the probability,