Question

② Threshold frequency of
a photo electric cell as 5.oox
104 HZ. Il a light say of 6 x 10'4 Hz frequency die
incised on
it
them
17 whether electron will emit or not.
is what will happened? If intensity of incident Light
is increase.
mis what will happened? It frequency of incident
of incident
May
is increase to 7x1014 Haz​

Answer 1

Answer:

Given, (In air)

Velocity V=340m/s

Frequency f=20,000Hz

Wavelegth λ=?

V=f.λ

λ=FV=20,000340=0.017Hz

Also, Given (in Water)

Velocity, V=1480m/s

Frequencyf=20,000Hz

wavelength, λ=?

V=F.λ

λ=FV=20,0001480=0.074Hz