Answer:
3. 3.45×10¯¹⁸ J.
4. 1.25×10¹⁵ Hz.
Explanation:
3. Determination of the energy of the photon.
Frequency (v) = 5.2×10¹⁵ Hz
Planck's constant (h) = 6.626×10¯³⁴ Js
Energy (E) =?
The energy of the photon can be obtained by using the following formula:
E = hv
E = 6.626×10¯³⁴ × 5.2×10¹⁵
E = 3.45×10¯¹⁸ J
Thus, the energy of the photon is 3.45×10¯¹⁸ J
4. Determination of the frequency of the radiation.
Wavelength (λ) = 2.4×10¯⁵ cm
Velocity (c) = 3×10⁸ m/s
Frequency (v) =?
Next, we shall convert 2.4×10¯⁵ cm to metre (m). This can be obtained as follow:
100 cm = 1 m
Therefore,
2.4×10¯⁵ cm = 2.4×10¯⁵ cm × 1 m /100 cm
2.4×10¯⁵ cm = 2.4×10¯⁷ m
Thus, 2.4×10¯⁵ cm is equivalent to 2.4×10¯⁷ m
Finally, we shall determine the frequency of the radiation by using the following formula as illustrated below:
Wavelength (λ) = 2.4×10¯⁷ m
Velocity (c) = 3×10⁸ m/s
Frequency (v) =?
v = c / λ
v = 3×10⁸ / 2.4×10¯⁷
v = 1.25×10¹⁵ Hz
Thus, the frequency of the radiation is 1.25×10¹⁵ Hz.
Ultrasound is sound or vibrations, having an ultrasonic frequency, particularly as used in medical imaging. Ultrasound is more commonly used in medical terminology than in industry. Infrasound is sound waves with frequencies below the lower limit of human audibility.
Answer:
5NO2? + 6H+ + 2MnO4? ? 5NO3? +2Mn2+ + 3H2O
Explanation:
Classify each reactant as the reducing agent, oxidizing agent, or neither
Answer:
6. a. 5.53 (m/m) %; b. 0.7490M
7. 0.156M
Explanation:
6. In the solution of KCl, there are 1.396g of KCl in 25.225g of solution. As mass/mass percent is:
Mass solute / Mass solution * 100
The mass/mass percent of KCl is:
a. 1.396g KCl / 25.225g solution * 100
5.53 (m/m) %
b. Molarity is moles of solute per liters of solution:
<em>Moles KCl -Molar mass: 74.55g/mol-:</em>
1.396g KCl * (1mol / 74.55g) = 0.018726 moles KCl
<em>Volume in liters: 25mL = 0.025L</em>
Molarity:
0.018726 moles KCl / 0.025L = 0.7490M
7. 0.90% means 0.90g of NaCl in 100g of solution:
<em>Moles NaCl -Molar mass: 58.44g/mol-:</em>
0.90g NaCl * (1mol / 58.44g) = 0.0154 moles NaCl
<em>Volume in Liters:</em>
100g * (1mL / 1.01g) = 99mL = 0.099L
Molarity:
0.0154 moles NaCl / 0.099L =
0.156M
