Jawaban:

1.

f = 100 Mhz = 100x10^6 Hz

λ = ?

c = 3x10^8 m/s

c = λf

λ = c/f = 3x10^8/100x10^6 = 3m

2.

λ = 100m

f = ?

f = c/λ = 3x10^8 / 100 = 3x10^6 Hz

3.

λ = 3cm = 0,03m

t = 12x10^-6 s

s = ?

s = vt = 3x10^8 * 12x10^-6 = 36x10^2 m

karena gelombang pergi-pulang, maka jarak pesawat 1/2 dari s

s pesawat = 1/2 s = 1/2 * 36x10^2 = 18x10^2 m

4.

Lo = 160 m

v = 0,9 c

L = So √1 - (v/c)^2

L = 160 √1-0,81 = 160*0,435 = 69,7 m

5.

v = 0,6c

E = Eo + Ek

Ek = Eo - E

Ek = moc^2 (1/γ  -1 )

γ = √1 - (v/c)^2

γ = √1 - (0,6c/c)^2

γ = √1-0,36 = 0,8

Ek = moc^2 (1/γ  -1 ) = moc^2 (1/0,8 - 1) = moc^2 * 0,25 = 0,25 moc^2

6.

v = 0,8 c

m =  mo 1/γ

γ = √1 - (0,8c/c)^2 = √1-0,64 = 0,6

m = mo / 0,6 = 1,67 mo

7.

λ = 450 nm = 450x10^-9

n = 2

E = ?

E = n h f = n hc/λ

E = 2*6,63x10^-34 * 3x10^8/450x10^-9

E = 0,0884x10^-17 J

8.

A = 10cm^2 = 10x10^-4 m^2

T = 1000 K

e = 1

σ = 5,67x10^-8 W^2/m^2K^4

P = eσAT^4

P = 1*5,67x10^-8 * 10x10^-4 * 1000^4

P = 5,67x10^1 =56,7 W

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