Im afraid i cant help u if we can’t see the image u r working with. could u provide an image of the question?
Answer:
159HZ A
Explanation:
frequency= speed/wavelength
frequency= 342/2.15=159HZ
Answer:
a) 
Explanation:
a) Let consider that disk accelerates and decelerates at constant rate. The expression for angular acceleration and deceleration are, respectively:
Acceleration

Deceleration

Since angular acceleration and deceleration have same magnitude but opposite sign. Let is find the maximum allowed angular speed from maximum allowed centripetal acceleration:




Maximum magnitude of acceleration/deceleration is:

The least time require for rotation is:


2 images attatched below
\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
The temperature at which the sample of liquid turns to gas at 135 °C is termed as boiling point.
Answer: Option A
<u>Explanation:
</u>
The observation of conversion of liquid to gas indicates that there is occurrence of change in the state of matter. The inter-conversion from one state to another can be done by either varying the temperature or by varying the pressure.
In this case, the liquid on heating gets converted to gaseous state after attaining a particular temperature say 135 °C. So, this process of conversion from liquid to gaseous state on heating is termed as boiling.
The temperature at which a liquid converts to gas is termed as the boiling point of that liquid.