4 x 108ms-1
2.25 x 108ms-1
\(\frac{4}{9}\) x 108ms-1
2.25 x 102ms-1
4.33 x 108ms-1
Correct answer is B
Air to water = \(\frac{\text{speed in air}}{\text{speed in water}}\)
\(\frac{4}{3}\) = \(\frac{3 \times 10^8}{V}\)
4V = 3(3 x 108)
V = \(\frac{3(3 \times 10^8)}{4}\)
V = 2.25 x 108ms-1
120J
60Jg-1
120Jg-1
1500J
1500Jg-1
Correct answer is C
Heat energy = Electrical energy
mL = I2RT
5 x L = 2 x 2 x 5 x 30
L = 120Jg-1
Which of the following electromagnetic waves has the shortest wavelength?
Radio waves
X-rays
Infra-red
Blue light
Ultraviolet
Correct answer is B
No explanation has been provided for this answer.
0.0cm3
2.0cm3
1.6cm3
0.625cm3
0.5cm3
Correct answer is E
At constant temperature P1V1 = P2V2
P2 = P1 + 40
= 10 + 40 = 50m
10 x 2.5 = 50 x V2
V2 = 0.5cm3
Which of the following statements is true? The frequency of a vibrating string is
proportional to its length
inversely proportional to the tension within it
proportional to the aptitude of vibration
inversely proportional to its cross-section
proportional to the square root of the tension within it
Correct answer is E
No explanation has been provided for this answer.