Question

state true or False

1.Mirror is not an reflecting surface..
2.The distance between focus and and pole is called focal length...
3.The speed of sound in air at 22°C is 344 m/s.
4.the frequency of infrasound is below 20HZ​

Answer 1

Answer:

this question of answer is 1st true 2nd false 3rd false 4th true

Answer 2

Answer:

Here's your answer ⬇️⬇️

1. False
2. true
3. true
4. true