A bat emits ultrasonic pulses at 50 kHz to navigate. This method is called

1. Bats emit ultrasonic clicks and listen to echoes. 2. From the time and direction of the echo, they map surroundings. 3. The chapter section on ultrasonic applications calls this echolocation. 4. So option A is correct. _Source: Selina Concise Physics Class 9, Ch 8 Sound (Mistral OCR'd PDF), section on ultrasonic applications_