12. What is the speed of a wave with a wavelength of 10 meters and a frequency of 100 Hz?

The speed of the wave is 1000 m/s.

Explanation:

Speed of a wave will always be equal to the product of wavelength and frequency of the wave.

Since, here the wavelength is given as 10 m and frequency is given as 100 Hz, the multiplication of these two terms will specify the speed of that wave.

Speed = Wavelength × Distance

Speed = 100 × 10 = 1000 m/s.

So, the speed of the wave is 1000 m/s.

answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg