Give the order of the following :
(a) 1
(b) 1000
(c ) 499
(d) 500
(e) 501)
(f) 1 AU `(1.496 xx 10^(11) m)`
(g) 1 Å `(10(-10)m )`
(h) Speed of light `(3.00 xx 10^(8) m//s)`
(i) Gravitational constant `(6.67 xx 10^(-11) N-m^(2)//kg^(2))`
(j) Avogadro constant `(6.02 xx 10^(23) mol^(-1))`
(k) Planck's constant `(6.63 xx 10^(-34) J-s)`
(l) Charge on electron `(1.60 xx 10^(-19) C)`
(m) Radius of H - atom `(5.29 xx 10^(-11)m)`
(n) Atmospheric pressure `(1.01 xx 10^(5) Pa)`
(o) Mass of earth `(5.98 xx 10^(24)kg)`
(p) Mean radius of earth `(6.37 xx 10^(6)m)`

Answer

To find the order of magnitude for each of the given values, we will express each number in the form \( A \times 10^N \), where \( A \) is between 0.5 and 5, and \( N \) is an integer. The order of magnitude is represented by \( N \).

### Step-by-Step Solution:

1. **1**:
- Write as \( 1 \times 10^0 \).
- **Order of magnitude**: \( 0 \).

2. **1000**:
- Write as \( 1 \times 10^3 \).
- **Order of magnitude**: \( 3 \).

3. **499**:
- Write as \( 4.99 \times 10^2 \).
- **Order of magnitude**: \( 2 \).

4. **500**:
- Write as \( 5.00 \times 10^2 \).
- **Order of magnitude**: \( 2 \).

5. **501**:
- Write as \( 5.01 \times 10^2 \).
- **Order of magnitude**: \( 2 \).

6. **1 AU (1.496 × 10^11 m)**:
- Already in scientific notation.
- **Order of magnitude**: \( 11 \).

7. **1 Å (10^{-10} m)**:
- Write as \( 1.0 \times 10^{-10} \).
- **Order of magnitude**: \( -10 \).

8. **Speed of light (3.00 × 10^8 m/s)**:
- Already in scientific notation.
- **Order of magnitude**: \( 8 \).

9. **Gravitational constant (6.67 × 10^{-11} N m²/kg²)**:
- Write as \( 0.667 \times 10^{-10} \).
- **Order of magnitude**: \( -10 \).

10. **Avogadro constant (6.02 × 10^{23} mol^{-1})**:
- Write as \( 0.602 \times 10^{24} \).
- **Order of magnitude**: \( 24 \).

11. **Planck's constant (6.63 × 10^{-34} J s)**:
- Write as \( 0.663 \times 10^{-33} \).
- **Order of magnitude**: \( -34 \).

12. **Charge on electron (1.60 × 10^{-19} C)**:
- Write as \( 1.60 \times 10^{-19} \).
- **Order of magnitude**: \( -19 \).

13. **Radius of H atom (5.29 × 10^{-11} m)**:
- Write as \( 0.529 \times 10^{-10} \).
- **Order of magnitude**: \( -10 \).

14. **Atmospheric pressure (1.01 × 10^{5} Pa)**:
- Write as \( 1.01 \times 10^{5} \).
- **Order of magnitude**: \( 5 \).

15. **Mass of Earth (5.98 × 10^{24} kg)**:
- Write as \( 0.598 \times 10^{25} \).
- **Order of magnitude**: \( 25 \).

16. **Mean radius of Earth (6.37 × 10^{6} m)**:
- Write as \( 0.637 \times 10^{7} \).
- **Order of magnitude**: \( 7 \).

### Final Orders of Magnitude:
- 1: \( 0 \)
- 1000: \( 3 \)
- 499: \( 2 \)
- 500: \( 2 \)
- 501: \( 2 \)
- 1 AU: \( 11 \)
- 1 Å: \( -10 \)
- Speed of light: \( 8 \)
- Gravitational constant: \( -10 \)
- Avogadro constant: \( 24 \)
- Planck's constant: \( -34 \)
- Charge on electron: \( -19 \)
- Radius of H atom: \( -10 \)
- Atmospheric pressure: \( 5 \)
- Mass of Earth: \( 25 \)
- Mean radius of Earth: \( 7 \)