World Geography
Which among the following statements is/are correct about Smog?It is formed in urban and industrial areas.It is formed when smoke is mixed with fogSelect the correct code from the options given below:
In urban and industrial areas smoke provides plenty of nuclei which helps in the formation of fog and mist. Smog is a condition when fog is mixed with smoke.
Ultrasound refers to a sound wave with a frequency greater than the upper limit of human hearing, which is generally over 20 kHz. In general, humans can hear sounds with a frequency between 20 Hz and 20 kHz.
EXAMIANS