Question

Can someone answer these?

Answer 1

Nine

Basically you are using d = r * t

Frequency is 1 / t

d is more commonly represented by lambda ($\lambda$). Lambda is the wavelength.

so the formula $\lambda$ = c / f

More commonly it is written as $\lambda$*f = c.

Givens

c = 3*10^8 m/s

$\lambda$ = 0.1 nm = 0.1 nm *[1 m /1 * 10^9 nm] = 0.1 * 10^ - 9 meters.

f = ??

f = $\dfrac{3*10^8}{0.1 * 10^-9}$

f = 3 * 10^8  * 10^9 /  0.1  = 3 *  10^18

Answer: C

Ten

$\lambda$ = c/f

$\lambda$ = 3*10^8 / 1 * 10^16

$\lambda$ = 3*10^-8 meters

$\lambda$ = 30 * 10^-9 meters = 30 nm

Answer: D