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• Sound waves are longitudinal mechanical waves and frequency can be defined as the number of wave cycles happening in one sec. • Ultrasonic waves or Ultrasound waves: The sound frequency above 20,000Hz (upper audible limit of human hearing) is known as ultrasonic waves. Humans cannot detect it too. • Examples: Bat produce Ultrasonic waves.
A new technology which provides the ability to create an artificial world and have people interact with it is called –
The frequency of ultrasonic waves is:
A sudden drop in barometric pressure indicates which of the following?
The distance- time graph for a body moving at uniform speed is?
When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is clue to the phenomenon of –
Which of the following is NOT a conductor of electricity?
The weight (W) of a body is derived from which formula?
A particle moves in a circle of radius 10 cm with a constant speed. Its angular displacement after 2 seconds is π radians. What is its linear speed?
Cryogenics is a branch of Physics that deals with what?
Which law states that “an object remains at rest or in uniform motion unless acted upon by an external force”?