The number of complete waves generated per second is called
Wavelength
Frequency
Displacement
Amplitude
A ship can determine the depth of a shoal of fish or the sea-bed with the help of
A sonar
Radio waves
Micro waves
X-rays
Which rays are used to kill cancer cells and also harmful bacteria in food and surgical instruments?
UV - radiation
Ultraviolet radiation
Gama rays
Which waves can be used for cooking?
Infrared waves
Microwaves
Light waves
If the earthquake occur under the sea, the seismic energy can be transmitted to the water and produce
Ultrasonic echo
Ultra violet radiation
Seismic waves
Tsunami
The spreading of wave at the edges or obstacle is called
Reflection
Refraction
Diffraction
Interference
Which technique is used by bats to judge how far an object is?
Ultrasonic echo technique
X - ray technique
Infrasonic echo technique
Ultraviolet radiation technique
The height of a crest or the depth of a trough measured from a wave is called
Sound waves with frequencies above 20 kHz are called
Infrasonic waves
ultrasonic waves
The behaviour of water waves can be studied in
Deep water
Shallow water
Ripple tank
Sea water
