All types of electromagnetic reaction travel through vacuum at
3 × 108 m/s
3 × 108 km/s
3 × 10-8 m/s
3 × 10-8 km/s
The number of complete waves generated per second is called
Wavelength
Frequency
Displacement
Amplitude
The longitudinal and transverse waves produced by earthquake are called
Radio waves
Infrared waves
Ultrasonic waves
Seismic waves
A ship can determine the depth of a shoal of fish or the sea-bed with the help of
A sonar
Micro waves
X-rays
Which waves can be used for cooking?
Microwaves
Light waves
The phenomenon in which electrons are ejected from metal surfaces when electromagnetic waves fall on them is called
Photoelectric effect
Magnetism
Spectrum
Interference
Which rays are used to kill cancer cells and also harmful bacteria in food and surgical instruments?
UV - radiation
Ultraviolet radiation
Gama rays
A disturbance which carries energy from one place to another without transferring matter is called
A transverse wave
A longitudinal wave
A progressive wave
Water wave
Waves travel more slowly in
Ocean
River water
Shallow water
Deep water
In the electromagnetic spectrum which waves have the longest wave length?
Light wave