Question

a) Define the elastic modulus. Explain the different types of elastic modulus.

b) State and explain Einstein's Photoelectric Effect theory.

c) If 12𝑁 force is applied to a fluid of cross-section 5.34 𝑐𝑚2 with a shearing rate of 0.7 𝑠 −1 then find the viscosity of the fluid

Answer 1

a) The elastic modulus is the property of a solid within which the external effort does not cause deformations that cannot be restored.

The types:

Young's modulus.

Shear (Rigidity) modulus

Bulk modulus.

b) A quantum of light falling on metals causes it is to emit electrons.

c) Determine the value:

$$\gamma=\frac F{Au}=31100\text{ Pa}·\text s.$$