Answer:
frequency = 0.47×10⁴ Hz
Explanation:
Given data:
Wavelength of wave = 6.4× 10⁴ m
Frequency of wave = ?
Solution:
Formula:
Speed of wave = wavelength × frequency
Speed of wave = 3 × 10⁸ m/s
Now we will put the values in formula.
3 × 10⁸ m/s = 6.4× 10⁴ m × frequency
frequency = 3 × 10⁸ m/s / 6.4× 10⁴ m
frequency = 0.47×10⁴ /s
s⁻¹ = Hz
frequency = 0.47×10⁴ Hz
Thus the wave with wavelength of 6.4× 10⁴ m have 0.47×10⁴ Hz frequency.
Answer:
2H2 + O2 -----> 2H2O
Not sure about the second question though.
Answer:
B) translucent
Explanation:
Light only partially passes through them.
Answer:

Explanation:
<u>Given reaction is:</u>
3X + 2Y → 5C + 4D
<u>In this reaction, we have:</u>
For 3 moles of X, 4 moles of D
So,
4D = 3X
Divide both sides by 4
D = 3X/4
Multiply both sides by 21
21D = 3X/4 × 21
21D = 3*21X/4
21D = 63X/4
21D = 15.75X
So, to produce 21 moles of D, we need 15.75 moles of X.
![\rule[225]{225}{2}](https://tex.z-dn.net/?f=%5Crule%5B225%5D%7B225%7D%7B2%7D)
Hope this helped!
<h3>~AH1807</h3>