Question 21 :
Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
Question 22 :
Intensity of sound at a point is ____ its distance from the source.
Question 23 :
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
Question 24 :
Radio telescopes are better than optical telescopes because
Question 25 :
Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit