Draw the sketches of two waves A and B that wave A has twice the wavelength and half the amplitude of wave B

The velocities of sound waves in four media P. Q, R and S are 18,000 km/h, 900 km/h, 0 km/h, and 1200 km/h respectively. Which medium could be a liquid substance?

A. P B. Q

C. R D. S

Which of the following can produce longitudinal waves as well as transverse waves under different conditions?

A. water B. TV transmitter

C. slinky D. tuning fork

A device called oscillator is used to send waves along a stretched string. The string is 20 cm long, and four complete waves fit along its length when the oscillator vibrates 30 times per second. For the waves on the string:

(a) what is their wavelength?

(b) what is their frequency?

(c) what is their speed?

Through which of the following materials can sound travel?

Wood, air, water, sream, ice, hydrogen, steel, diamond.