Non-renewable energy resources include ___.

There are ___ types of concentrated solar power.

___ is the main constituent of these fossil fuel.

Reflection of sound obeys the laws of reflection.

Cavitation bubbles are created at sites of rarefaction.

A prenatal ultrasound test uses low-frequency sound waves.

For every 10 dB added to the sound level, the loudness of the sound is increased by 10 times.

Pitch of the note is determined by its frequency.

The greater the intensity, the greater is the loudest of the sound.

Manufacturers of concrete use ___ to check for cracks or cavities.

Wavefront is always parallel to the direction of propagation or raysm

Monochromatic light (a particular wavelength) from a single source are used in his experiment.

According to Huygens' principle, secondary wavelets only propagate backward from the wavelength.

The phase angel is measured in radian.

Destructive interference creates the dark fringes in the interference pattern.

A laminated core should be used to reduce the flow of Eddy current.

Magnetic flux is a vector quantity.

A transformer is used to change the voltage of an alternating current.

The commonly used invisible light for LED is white light

An inertial frame is a frame of reference that has no acceleration.

Which type of lenes are used in telescope?