1.

A_black_body_radiates_energy_at_the_rate_of_1×105_J/(sm)2_at_a_temperature_of_227°C._The_temperature_to_which_it_must_be_heated_so_that_it_radiates_energy_at_the_rate_of_1×109_J/(sm)2$

A. 5000 K
B. 5000°C
C. 500 K
D. 500°C
Answer» B. 5000¬¨¬®‚Äö√†√ªC


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