Question

Please answer these!

Answer 1

6. f = 128.62 $s^{-1}$ , T= 0.0077775 s

7. f  = 2.2 * $10^{4}$ $s^{-1}$, T = 4.545 * $10^{-5}$ s

8. 32.64 $s^{-1}$

9. 3.29 * $10^{14}$ $s^{-1}$

Explanation:

Step 1:

6.

For light and sound v = fλ

where v represents the velocity

f represents the frequency

λ represents the wavelength

λ = 2.69 m

v = 346 m/s

f = v/λ = 346/2.69 = 128.62 $s^{-1}$

Time period is the reciprocal of frequency

T = 1/128.62 = 0.0077775 s

Step 2:

7.

λ = 110 cm = 1.1 m

v = 2.42*$10^{4}$ m/s

f = 2.42*$10^{4}$/1.1 = 2.2 * $10^{4}$ $s^{-1}$

T = 1/(2.2*$10^{4}$) = 4.545 * $10^{-5}$ s

Step 3:

8.

λ = 10.6 m

v = 346 m/s

f = v/λ = 346/10.6 = 32.64 $s^{-1}$

Step 4:

9.

λ = 5.89 * $10^{-7}$ m

v = 1.94 * $10^{8}$ m/s

f = v/λ = 3.29 * $10^{14}$ $s^{-1}$