Question

1. Voice of which of the following is likely to have a minimum frequency?
2. In which of the following materials is the speed of sound maximum?
3. To hear a distinct echo, the minimum distance of a reflecting surface should be
Ideas
I. Select the correct option:
(a) A baby boy
(c) A man
(a) Air
(c) Fresh water
(b) A baby girl
(d) All have equal frequencies
(b) Iron
(d) Milk
(b) 17 m
(d) 10 m
(a) 7 m
(C) 27 m
4. Bats are able to respond to
(a) infrasonic vibrations
(b) ultrasonic vibrations
(C) neither infrasonic nor ultrasonic vibrations
d) both infrasonic and ultrasonic vibrations
5. Which of the following physical quantities is measured in angstrom unit?
(a) Amplitude
(b) Frequency
(C) Wavelength
(d) Time period

Answer 1

Answer:

1.a man

Explanation:

i only know question 1