Does heat transfer by radiation need a material medium ?

How is heat transferred ?

A mode of transfer of heat through a material medium from a point at higher temperature to a point at a lower temperature without actual migration of the particles of the medium is __________

How heat transfer occurs through radiation in absence of a medium?

Answer the following. : With neat diagram, describe experimental verufication that sound requires a material medium for its propagation.

How do you find work done, heat transferred and the change in internal energy for an isobaric process?

Answer the following : Explain the experiment, with neat diagram, to prove the following: 'Sound needs material medium for propagation.'

In medium where E. coli was growing lactose was added, which induced the lac operon. But why does lac operon shut down after some time after addition of lactose in the medium?

We have learnt in the sixth standard that sound travels through some material medium like solid, liquid or gas and reaches us. But what if such medium does not exist between the source of sound and our ear?

Which of the following waves do not require material medium for propagation?

Is there any heat transfer when the body is in thermal equilibrium with the surrounding ?