Design an experiment to test the movement of thermal energy by radiation

Answer:
There are two experiments that I could find, I'll explain them and link them below.

First:

Materials: Candle, candle holder

Procedure:

• Take a candle and light it. Then, place it into a holder.
• Now, hold your hand above the candle.
• Now hold your hand on the side of the candle.

Link: https://www.siyavula.com/read/science/grade-7/heat-energy-transfer/13-heat-energy-transfer

Second:

Materials: Solar tube balloon, kite string

Procedure:

• Inflate the balloon in shade. And tie it with a kite string.
• Take it to a sunny area.
• Eventually the balloon will begin to rise.

Link: https://sciencing.com/experiments-heat-radiation-8394320.html

Step-by-step explanation

First: When you hold your hand above the candle, it'll feel hot because of the warm air rising up due to convection. The lit candle warms the surrounding air and the warm air starts rising. But, air molecules will not travel sideways due to convection. The heat you feel when you hold your hand on the side of the candle is due to radiation.

Second: The solar tube balloon is made of dark plastic. So, due to solar radiation, the air inside the inflated balloon will begin to heat and expand causing the balloon to rise.