A wavelength of light is 2,000 m. What is the frequency?

Answer 150000Hz

Explanation:

Given that:

Wavelength (λ)= 2000m

Frequency F = ?

Speed of light V = 3 x 10^8 m/s ( Recall that the speed of light is constant, with a value of 3 x 10^8 m/s)

So, apply V = F λ

3 x 10^8m/s = F x 2000m

F = (3 x 10^8m/s ➗ 2000m)

F = 150000Hz

Thus, the frequency of the light wave is 150000 Hz

Frequency is 1.5 × 10^5 Hz

Explanation:

f = c/λ, where f is the frequency, c is the speed of light = 3 × 10^8 m/s and λ is the wavelength.

⇒ f = 3 × 10^8/2000

      = 3/2 × 10^8 × 10^-3

      = 1.5 × 10^5 Hz

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

c) up is the direction the magnetic force is acting on the charge.