← Checkpoint Science
Conclusions, predictions and evaluating evidence · 19 left
Quick drill · instant marking
Try it free — the AI marks 3 answers a day. A free account marks 30 a day.
Sign up free →
Suggest two reasons why the second team repeats the recording at each place on ten nights. Write your two reasons separated by a comma.
[2 marks]
Type
Photo · Sign up
Write · Sign up
√ Symbols
$x$
a⁄b
xⁿ
xₙ
√
( )
×
÷
±
≈
π
θ
→
°
+ More symbols (IGCSE / A-Level — all subjects)
Calculus
ⁿ√
∫
∮
dy/dx
d/dx
∂
∑
∏
lim
∞
f′
∇
∝
Functions
sin
cos
tan
sec
cosec
cot
sin⁻¹
ln
log
logₐ
eˣ
|x|
Greek
α
β
γ
δ
ε
η
λ
μ
ν
ρ
σ
τ
φ
χ
ψ
ω
Δ
Σ
Π
Ω
Φ
Λ
Θ
Relations & logic
≠
≡
<
>
≤
≥
≪
≫
≅
∼
∴
∵
⇒
⇔
Sets & numbers
∈
∉
⊂
⊆
∪
∩
∅
∀
∃
ℝ
ℤ
ℕ
ℚ
ℂ
Vectors, matrices & stats
a⃗
â
𝐚
AB⃗
·
ⁿCᵣ
matrix
x̄
x̂
σ²
n!
Physics
×10ⁿ
Ω
μ
λ
ω
ρ
Δ
∝
≈
°C
Chemistry
₂
₃
₄
₅
₆
⁺
⁻
²⁺
²⁻
→
⇌
⟶
Δ
δ⁺
δ⁻
•
⦵
(s)
(l)
(g)
(aq)
Preview
📷 Tap to photograph your answer
Marked point by point against the mark scheme.
Check answer →
🧭
Modelled on Cambridge Checkpoint 0893 · Apr/May 2026 · Paper 1 · Q10(b)(ii)
Stuck? Get a hint
Free
Guided Hint
— no answers, just a nudge
Close ✕
Thinking
.
.
.
One more nudge →
Let me try now
Worked solution
Show all steps
That's the full method. Now try one like it yourself.