A woman and her daughter of class XII in KV were , in the kitchen, preparing a feast for visitors using the new microwave oven purchased last evening. Suddenly, the daughter noticed sparks inside the oven and unplugs the connection after switching it off. She found that inside the microwave oven a metallic container had been kept to cook vegetable. She informs her mother that no metallic object must be used while cooking in microwave oven and explains the reasons for the same.
(a) What attitude of the daughter inspires you?
(b) Give another use of a microwave oven.
© The frequency of microwave is $3\times {{10}^{11}}$Hz. Calculate its wavelength.
(a) Presence of mind and knowledge of subject.
(b) Used in telecommunication.
©$\lambda ={c}/{v=\frac{3\times {{10}^{8}}}{3\times {{10}^{11}}}};={{10}^{-3}}$