Physics
Hertz is a unit for measuring

Intensity of waves
Wavelength
Frequency of waves
Clarity of waves

ANSWER DOWNLOAD EXAMIANS APP

Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Acceleration in the orbit which is equal to the acceleration due to gravity outside
Presence of gravity outside but not inside the spacecraft
Fact that spacecraft in the orbit has no energy
Absence of gravity outside

ANSWER DOWNLOAD EXAMIANS APP