In the electromagnetic spectrum which waves have the longest wave length?
Microwaves
Light wave
Radio waves
X-rays
A ship can determine the depth of a shoal of fish or the sea-bed with the help of
A sonar
Micro waves
The behaviour of water waves can be studied in
Deep water
Shallow water
Ripple tank
Sea water
The spreading of wave at the edges or obstacle is called
Reflection
Refraction
Diffraction
Interference
A bigger crest is formed at the point where two smaller crests from two different sources meet simultaneously is called
Waves in phase
Waves out of phase
Polarisation
The longitudinal and transverse waves produced by earthquake are called
Infrared waves
Ultrasonic waves
Seismic waves
The pitch of a note depends on
The frequency of the sound
The wavelength of the sound
Speed of a sound
All the above
The number of complete waves generated per second is called
Wavelength
Frequency
Displacement
Amplitude
Sound waves with frequencies above 20 kHz are called
Infrasonic waves
ultrasonic waves
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
