Physics
A wavelength of 0.3 m is produced in air and it travels at a speed of 300 m/s. Then it will be an

Microwave
Ultrasonic wave
Infrasonic wave
Audible wave

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Physics
Pressure Cooker cooks faster because

Higher temperature is attained for cooking
Boiling point decreases with rise of pressure
The material of the cooker is a good conductor
It cooks the food at low pressure

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