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.
Water
It can be a solid or a liquid
Answer:
Question 1: -7.3ºC
Question 2: 67.50%
Explanation:
Question 1:
For different reasons a thermometer can not give the exact temperature that it is measuring, such as incorrect calibration. So the thermometer will have an error, and for this, we can have a thermometer correction, doing experiments with a substance that we know the temperature. In this question that substance was benzoic acid.
The thermometer correction (Tc) is the temperature that was measured less the real temperature, so:
Tc = 115.1 - 122.4 = -7.3ºC
It means that the temperature given by the thermometer is 7.3ºC less than the real.
Question 2:
Recrystallization is the process of transforming the liquid in its solid form (crystals). So, the sample of 4.00 grams of benzoic acid, there'll be water or other impurities. The total benzoic acid given was 2.70 grams, so its percentage will be:
(mass of acid/ total mass)x100%
(2.70/4.00)x100% = 67.50%
Hi There! :)
<span>What happens when a magnet is passed through a wire loop
</span><span>Electrical energy is converted to mechanical energy</span>
