What is the wavelength of a wave with a velocity of 50 m/s and a frequency of 5hz a 250 m b 0.1 m c 10m d 0.01 m

C. 10 m

Explanation:

The speed of a wave v = λf where λ is the wavelength and f the frequency of the wave.

Making λ the subject of the formula we get

λ= v/f  

f= 5 Hz

v= 50 m/s

λ= 50 m/s÷ 5 Hz

=10 meters

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

let that person have a turn to speak : )