What properties should the metal used for thermal emission have? , 12 | Radiation and matter...

The metal used for making radiation sheild is

What are the properties that the alloy used for minting coins should have?

What should be the properties of the medium for producing sound waves ?

What are the physical properties of metals and nonmetals?

Why a metal container should not be used in a microwave oven?

What will be the ratio of temperatures of sun and moon if the wavelengths of their maximum emission radiations rates are 140A^(@) and 4200A^(@) respectively .