0.22eV
4.59eV
5.38eV
8.38eV
10.32eV
Correct answer is C
Work function = Total energy - kinetic Energy
= 6.88 - 1.50 = 5.38 ev
14.4 A
1.0 A
3.2 A
9.6 A
Correct answer is B
| I | V |
| R |
| = | 12 |
| 12 |
270 Hz
512 Hz
488 Hz
356 Hz
Correct answer is A
f1 = 225Hz, T1 = 225N
f2 = ? T2 = 324N
But f ∝ √T => f = K√T
=> K = f/√T
∴ f1/√T1 = f2/√T2
225/√225 = f2/√324
| f2 = | 225√324 |
| √225 |
f2 = 270Hz
10 cm
25 cm
16 cm
14 cm
Correct answer is A
m = v/u = -3
v = -3u
f = 15cm
1/v + 1/U = 1/f
1/-3U + 1/u = 1/15
2/3u = 1/15
3U = 15 x 2
U = 30/3
= 10 cm
| _q2 |
| 4πεor2 |
| _q2 |
| 4πεor |
| _q |
| 4πεor2 |
\(\frac{q}{4πΣ_or}\)
Correct answer is D
Electric potential is work done in taking a unit mass or charge from infinity to that point
| V = | w | = | Fr | = | Q1Q2 | x | r |
| Q | Q | 4πεor2 | Q1 |
| = | _q |
| 4πεor |