Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If the frequency of an emitted x-ray is 1.6 x 10^{16}Hz, the accelerating potential is?
[e = 1.6 x 10^{-19}J, h = 6.63 x 10-^{34}Js]
6630.0V
663.0V
66.3V
6.6V
Correct answer is C
Given f = 1.6 x10^{16}H_{3}, h = 6.63 x 10^{-39}Js
e = 1.6 x 10^{-19}C, V = ?
V = \frac{w}{e} = \frac{hf}{e} = \frac{1.6 \times 10^{16} \times 6.63 \times 10^{34}}{1.6 \times 10^{-19}}
= 66.3V
530000J
23200J
17200J
130000J
Correct answer is D
H = mc\bigtriangleup\theta + mL
H = ?
m = 50g, c = 4.23J/gk,L = 2260, \bigtriangleup\theta = 80ºC
H = 50 [4.23 x 80 + 2260]
= 129920 \approx 130,000J
680m
170m
34m
85m
Correct answer is D
V = \frac{2d}{t}
v = 340ms^{-1}
t = 0.5s
d= ?
d = \frac{2d}{2} = \frac{340 \times 0.5}{2} = 85m