The frequency of ultrasound wave is typically
1). Above 20 kHz
2). Above 20000 kHz
3). Below 20 kHz
4). Below 02 kHz
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1. Which of these is a dwarf planet?
2. Which of the following was India's first interplanetary mission?
3. Which microscope is often used to view metal surfaces?
4. The shape of our milky way galaxy is
6. The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes?
8. What type of lens is a magnifying glass?