wave motion

1. A tuning fork has a frequency 256 Hz. When it is excited and placed on a table, the table vibrates.
a. In which name the vibration of the table is known? (1)
b. What will be the frequency of the table at this time? (1)
c. Does there is any chance to have resonance here? Justify. (1)

1. A wave formed in 0.2 second is given below. Analyse it and answer the following questions-

a) What is the wavelength of this wave? (1)

b) Find out the frequency of the wave? (1)

c) Find out the velocity? (2)

3. If a sound is produced in a closed room of 4 m length and breadth, the sound get boomed and not clear.
a) what is the name of this phenomenon ? (1)
b) Does there is any chance to have echo here ? Justify?(1)

4. Write any two things which is done in the Cinema Theatre to reduce the sound problem?