(a) Electromagnetic wave produced in some radioactive decay is $\mathit{\gamma }$-rays (frequency $>$ $3\times {10}^{17}\mathrm{Hz}$ ).
(b) Electromagnetic wave produced in arc welding are UV $\left(7.5\times {10}^{14}-3\times {10}^{16}\mathrm{Hz}\right),\mathrm{IR}(3\times {10}^{12}-$ $4.3\times {10}^{14}\mathrm{Hz})$ and visible $(4.3\times {10}^{14}-7.5\times {10}^{14}.$ $\mathrm{Hz}$ ) rays.
(c) Electromagnetic wave produced in TV remote is IR rays.