False. That description fits the wave's 'frequency'.
It has nothing to do with refraction.
Answer:
P = 11666.6 W
Explanation:
Given that,
Work done by the motor, W = 3500 kJ
Time, t = 5 min = 300 s
We need to find the power developed by the motor. Power developed is given by :

So, the required power is 11666.6 W.
Explanation:
Diffraction is a characteristic phenomenon for waves, and is based on their variance to find an obstacle or a crack. The diffraction and interference are inseparable phenomena, which are so harder to identify. Since diffraction is a specific type of interference.
if the point are in the order 2, and
the equation is d×senx=mL y at m=2
Answer:
The angular speed of the record is 3.36 rad/s.
Explanation:
Given that,
Mass of record= 0.10 kg
Radius = 0.10 m
Angular speed = 4.7 rad/s
Moment of inertia 
Mass of putty = 0.020 kg
We need to calculate the angular speed
Using law of conservation of momentum



Put the value into the formula


Hence, The angular speed of the record is 3.36 rad/s.