light must travel from an optical less dense to a denser medium
the angle of incidence must be equal to the critical angle
the angle of incidence must be greater than the critical angle
the angle of refraction must be 90o
Correct answer is C
No explanation has been provided for this answer.
A wave of weight length 0.30m travels 900m in 3.0s, calculate its frequency
68.0Hz
225.0Hz
1000Hz
750.0Hz
Correct answer is C
V = \(\frac{s}{t} = \frac{900}{3} = 300\)m\s
f = \(\frac{v}{\pi} = \frac{300}{0.30}\)
= 1000Hz
68.23cm3
47.91cm3
44.60cm3
30.75cm3
Correct answer is D
\(V_2 = \frac{P_1V_1T_2}{P_2T_1} = \frac{9.52 \times 10^4 \times 40 \times 273}{1.034 \times 10^5 \times 327}\)
= 30.75cm3
increased four times
doubled
unchangeable
halved
Correct answer is D
No explanation has been provided for this answer.
Which of the following statement about latent heat of vaporization is correct? It
weakens the adhesive force between molecules of a liquid and those of its container
breaks completely the force of attraction completely between the molecules of a liquid
add to the heat content of a liquid
increases the cohesive forces between liquid molecules
Correct answer is B
No explanation has been provided for this answer.