Physics Questions

Which of the following waves cannot be polarised?

Calculate the time period (in seconds) of a sound wave of wavelength 4m traveling with a speed of 500m/s

Ozone protects biosphere from ___________

What is the unit of resistance?

A wooden block of mass m1 kg accelerates at m/s when a force of 5 N acts on it. Another block of mass m2 kg accelerates at 20 m/s when the same force acts on it. If both the blocks are tied together and the same force acts on their combination, the acceleration will be about

The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 127.5 V ?

A Sonar of a ship sends sounds waves of speed 1000 m/s. These waves are reflected back by the ocean floor in 2 seconds. Find the depth (in m) of theocean floor. 

The rate of change of linear momentum of a body is proportional to the ___________ acting on it.